a substance has a half-life of 100,000 years and an initial mass of 1,000 grams. how many years will pass before only 250 grams of the substances parent material is left?

Answers

Answer 1
I`ll take a gander and say 200,000 years

Related Questions

What is the main sense organ for each of the 5 senses?

Answers

"Brain" is the main sense organ for each 5 senses 'cause it acts on them, and send a information of task for in-rsponse

Hope this helps!

Which claim below accurately explains how the process of meiosis results in genetic variation?

Answers

Below are the options:

Having two phases of meiosis allow for more unique cells to be produced.


Meiosis is a form of asexual reproduction which leads to more genetic variation.


Meiosis produces 4 haploid daughter cells which all contain identical DNA segments.


Crossing over during metaphase allows segments of DNA from 2 parents to SWAP and produce non-identical haploid cells.

The answer Meiosis is a form of asexual reproduction which leads to more genetic variation

What defines an air mass?

The humidity is consistent at a specific altitude.

The temperature is consistent at a specific altitude.

The temperature and humidity are consistent at a specific altitude.

The temperature and humidity are consistent at all altitudes.

Answers

Answer - The temperature and humidity are consistent at all altitudes.

Reason - Air mass is every where they adapt to a characteristic of above and below and any where. It's also identified by temperature and water vapor aka like evaporate tiny molecules.
Yea its D for correct answer

Explain why some substances are able to pass through the cell membrane

Answers

The most important property of the cell membrane is its selective permeability: some substances can pass through it freely, but others cannot. Small and nonpolar (hydrophobic) molecules can freely pass through the membrane, but charged ions and large molecules such as proteins and sugars are barred passage. 
selective permanently, is the reason why the cell membrane only let's certain things pass through. small noon polar molecules (oxygen & carbon dioxide) pass through by simply diffusing. But other molecules use other types of passive transport or active transport.

How does oxygen production relate to the rate of photosynthesis?

Answers

In the process of photosynthesis, plants use water (H₂O) and carbon dioxide (CO₂) to produce glucose (C₆H₁₂O₆) and oxygen (O₂) is released as a waste product:

H₂O + CO₂ → C₆H₁₂O₆ + O₂

So, more photosynthesis means more oxygen. In other words, the higher the rate of photosynthesis is, the higher is oxygen production.

Photosynthesis produces the glucose that is utilized in cellular respiration to make ATP. The glucose is then transformed back into carbon dioxide, which is used in photosynthesis. While water is split down to form oxygen through photosynthesis, in cellular respiration oxygen is mixed with hydrogen to form water.The oxygen production compares to the rate of photosynthesis because there is a greater flow of oxygen when it narrates to photosynthesis at a great rate.

The overall reaction is described as follows.

H₂O + CO₂ → C₆H₁₂O₆ + O₂


An organic compound that contains carbon, hydrogen, and oxygen is most likely

Answers

It is likely a carbohydrate

which of the following statements about colonial organisms is correct

Answers

Their cell activities are integrated
I Believe the Answer is (B)

Squirrels gather as many nuts as possible and bury them to prepare for winter. Which type of behavior is this?

Answers

Answer:

The correct answer is fixed action pattern behavior.

Explanation:

A fixed action pattern refers to an instinctive behavioral response initiated by a very particular stimulus. Once initiated, the fixed action pattern behavior cannot be ceased in the midway, it is performed till the end. The behavior is generated by a neural network called the innate releasing mechanism.  

The fixed action pattern is stimulated in reaction to an external sensory stimulus called in the term of animal behavior as a sign stimulus. For example, the gathering of as many nuts as possible by the squirrels and burying them to prepare for the winters, no matter what the condition is an illustration of fixed action pattern behavior.  

The behavior of storing food for later use is known as caching or hoarding, observed in animals like squirrels to prepare for scarcity. The correct term for this behavior is "caching" or "hoarding."

Caching is a natural behavior observed in many animal species, including squirrels, where individuals store food in various locations to be retrieved and consumed later. This behavior is particularly common in times of plenty to prepare for periods of scarcity, such as winter. By caching nuts and other food items, squirrels ensure they have a supply of food to sustain them through times when food is not readily available. This strategy is an example of foresight and planning for future needs, which is crucial for the survival of the species.

In a population of gerbils, long hair (H) is completely dominant over short hair (h). If 18% of the population has short hair, calculate the percentage of the population that is expected to be heterozygous (Hh). ...?

Answers

Below are the choices that can be found elsewhere:

A) 29% 
B) 58% 
C) 80% 
D) 49%

q^2 + 2pq + p^2=1 


And q + p = 1 

You have q^2 which is 0.18, which stands for the homozygous recessive. p^2 is homozygous dominant percentage while 2pq is what you're looking for, heterozygous. 

Anyway to find your answer, square root q^2 to find q, then you can use q+p=1 to find p. Then use 2pq to find the percent of heterozygotes. The answer for your question is D.

Answer:

49 percent

Explanation:

I got this question correct on the quiz.

How many calories are in carne asada nachos from Albertos?

Answers

935 thats too much for me, i cant take it

A marine biologist was taking photographs of ocean animals. One animal had tentacles with long stinging cells on the end. Which of these groups did the animal belong to?

A.
mollusks

B.
cnidarians

C.
arthropods

D.
sponges

Answers

cnidarians

hope this helps :)

Final answer:

The animal observed by the marine biologist, characterized by tentacles with long stinging cells, belongs to the group of (option B.) cnidarians. This group, which includes jellyfish, corals, and sea anemones, uses cnidocytes with nematocysts to immobilize prey.

Explanation:

A marine biologist observed an animal with tentacles possessing long stinging cells at the end, indicating that the animal belongs to the group cnidarians. Cnidarians, a phylum that includes organisms like jellyfish, corals, and sea anemones, are known for their unique cells called cnidocytes, which contain nematocysts (stingers). These specialized cells are designed to immobilize prey with toxins, allowing cnidarians to catch their food effectively. The presence of tentacles with stinging cells is a distinctive feature of cnidarians, distinguishing them from other groups such as mollusks, arthropods, and sponges.

The cells in your body need nutrients and other materials to stay alive. To be used by your cells, the materials must be
a. slightly acidic
b. eukaryotic
c. dissolved in fluid
d. transgenic

Answers

b. eukaryotic is the answer. 

The cells in your body need nutrients and other materials to stay alive. To be used by your cells, the materials must be dissolved in fluid. The correct option is c.

What is a cell?

Cells are the fundamental building blocks of all life. Various of cells make up the human body. They give the body structure, absorb nutrients from food, and convert those nutrients into energy.

The cell, first discovered by Robert Hooke in 1665, has a rich and interesting history that has led to many of today's scientific advances.

Cells, as we've seen, require a constant supply of energy to generate and maintain the biological order that keeps them alive.

This energy is derived from the chemical bond energy in food molecules, which serve as fuel as a result.

To survive, cells in the body require nutrients and other materials. The materials must be dissolved in fluid before they can be used by cells.

Thus, the correct option is c.

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Arrange the celestial bodies in our solar system in increasing order based on their size.

Answers

Sun,Jupiter,Saturn,Uranus,Neptune,Earth,Venus,Mars.
These are just the planets. There are much much more if you include moons too.

Sun, Jupiter, Saturn, Uranus, Neptune, Earth, Venus, and Mars.

What is celestial bodies?

A glowing plasma spheroid that is held together by its own gravity is the basic building block of a star, a type of astronomical object. The Sun is the star that is closest to Earth.

Due to their immense distance from the Earth, many additional stars are visible to the unaided eye from the surface of the planet at night while gazing at a variety of fixed luminous locations in the sky. The brightest stars received formal labels, and historically, the most visible stars were organized into constellations and asterisms.

Star catalogues that list known stars and provide standardized stellar designations have been assembled by astronomers. However, the number of stars in the universe is estimated to be over 300 sextillions (3 1023), including all-stars outside of our galaxy (the Milky Way).

Therefore, Sun, Jupiter, Saturn, Uranus, Neptune, Earth, Venus, and Mars.

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Why is UVA light considered a mutagen?



It penetrates the skin and can cause mutations.

It can be prevented by wearing a protective vest.

It produces chemicals that can be inhaled.

It is found in synthetic dyes and cosmetics.

Answers

The answer is It penetrates the skin and can cause mutations.


An agent able to cause DNA mutations is called mutagen. UV light is the most common source of radiation that affects DNA, but it is a weak radiation and it penetrates only the surface cells of your skin. However, UVA radiation is considered as a mutagen because it penetrates deep into the skin and can cause mutations. 

Final answer:

UVA light is a mutagen because it can penetrate the skin and cause DNA damage. This damage can lead to mutations and potentially skin cancers. Protective clothing and sunscreen can help mitigate the risk.

Explanation:

UVA light is considered a mutagen because it has the ability to penetrate the skin and cause mutations. It does this by causing damage to the DNA in the cells of the skin. When UVA light hits the skin, it can break DNA strands or cause errors during DNA replication, which can result in mutations. Over time, these mutations may accumulate and lead to skin cancers like melanoma.

One way to protect oneself from UVA light is by wearing protective clothing or using sunscreens. However, prevention is not always complete, as some amount of UVA light can still get through these protective barriers.

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One active transport process that occurs in the electron transport process in the membrane of the _____________ is the transport of protons to produce a proton gradient to power the production of ATP.

Answers

...membrane of the CELL...

the answer is B, it is mitochondria

How does carbon in sediments reach the atmosphere

Answers

decomposition, fossil fuel formation, fossil fuel emmision

Compare the chromosomes in the two daughter cells produced by Meiosis I. Do these chromosomes have the same alleles? How do you know?

Answers

yes. daughter cells have to match

what is an alternative future for cells when they reach their size limit? ...?

Answers

An alternative future for cells when they reach their size limit are:

1. Divide, forming two smaller daughter cells. 
2. Become large by dint of becoming multinucleated, and flattening (slime mold) or becoming a "tube" (fungi) to maintain surface area to volume ratio. 

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Which of the following outcomes would be most likely if the membrane of a cell were no longer selectively permeable?

A)A cell wall would form outside the membrane to protect the contents of the cell.

B) Harmful substances would be able to enter the cell and cause mutations to the cell’s DNA.

C) The cell would die as it would not be able to regulate which substances could enter and leave.

D) The cell would grow as more nutrients would be able to easily enter the cell. ...?

Answers

The correct answer is:

The cell would die as it would not be able to regulate which substances could enter and leave.

:)


The most likely outcome if a cell membrane lost its selective permeability would be the death of the cell, as it would be unable to maintain homeostasis and regulate substance movement, leading to harmful consequences.

The correct option is 'C'.

If the membrane of a cell were no longer selectively permeable, the most likely outcome would be C) The cell would die as it would not be able to regulate which substances could enter and leave.

The plasma membrane's primary function is to maintain selective permeability, which is crucial for sustaining life within the cell.

Losing this ability would lead to an inability to maintain homeostasis, an essential stable internal environment. Without a selectively permeable membrane, harmful substances could enter the cell, essential nutrients could be lost, waste products could accumulate, and even the movement of water could cause the cell to swell and burst.

What is the first 25 cm of the small intestine called?

Answers

its called the duodenum.

hope this helps you

Which of the following best defines soil texture? A A measure of how developed a soil is B Amount of nutrients in the soil C Depth of the soil D The relative amounts of sand, silt and clay particles

Answers

Correct answer is D "the relative amounts of sand, silt, and clay particles"

Genetic Engineering in Bacteria. Human DNA is spliced into the _______, which is a small ring of DNA in bacteria. The _________ takes up the plasmid. It now contains the human gene. The bacterial cell reproduces the _____________ that the human gene codes for.

Answers

Here are the answers that would best complete the given statements above. Genetic Engineering in Bacteria. Human DNA is spliced into the PLASMID , which is a small ring of DNA in bacteria. The BACTERIAL CELL takes up the plasmid. It now contains the human gene. The bacterial cell reproduces the PROTEIN that the human gene codes for. Hope this answer helps.

The products of photosynthesis are the

Answers

Oxygen and sugar in glucose form.
When a plant takes in H20 (water) and rays from the sun, it also takes in CO2 (carbon dioxide), and it compounds the molecules and it produces Glucose( a type of sugar used for energy) and Oxygen

which gland in the endocrine system is involved in dwarfism?

Answers

Answer: Pituitary Gland

Explanation:

Pituitary dwarfism or the growth hormone deficiency is the condition in which the pituitary gland of the body does not makes enough hormone.

This results in a slow growth in the child and it results in small stature. The height of the child does not increases and and other growth related characters are also not found at the right time.

This is so because the growth hormones are not released from the pituitary gland.

what are the special properties of water

Answers

Boiling Point and Freezing Point
Surface Tension
Heat of Vaporization and Vapor Pressure
Viscosity and Cohesion
Solid State
Liquid State
Gas State

Denise heats a beaker of dilute acid on a hot plate in a fume hood. What should Denise wear to best protect herself when she transports the beaker to a balance outside the hood?
A. heat-proof gloves, a lab coat, and close-toed shoes
B. goggles, a lab coat, and close-toed shoes
C. goggles, a lab coat, and heat-proof gloves
D. goggles, a lab coat, heat-proof gloves, and close-toed shoes

Answers

The correct answer is D. goggles, a lab coat, heat-proof gloves, and close-toed shoes

This will protect her from everything since the fumes could enter her eyes, or they could spill on her hands, body, or feet, so all of this protection is necessary if it is an acid. 

Answer: Option (D) is the correct answer.

Explanation:

Working in a laboratory can be dangerous if proper precautions are not followed.

Since, Denise heats a beaker of dilute acid on a hot plate in a fume hood so, he should be wearing goggles, a lab coat, heat-proof gloves, and close-toed shoes.

This is because even if accidentally acid spurts or falls on his feet then his skin must be covered so that he doesn't get burned.

A population of sixteen emu grew to thirty-nine in one year. After two years, the population had grown to forty-eight. The maximum number of emu that the environment can support is approximately sixty due to limited resources such as food and water. The carrying capacity of the emu population is

Answers

The answer is sixty.

A carrying capacity is the maximum size of some population in the given environment. It represents the number of animals that can live, reproduce, survive in the given area regarding the indefinite sustainability of this area in terms of resources. If the maximum number of emu that the environment can support is approximately sixty, then the carrying capacity must be 60 as well

Answer:

60

Explanation:

"The maximum number of emu that the environment can support is approximately sixty due to limited resources such as food and water."

20 POINTS!!! MORE THAN ONE ANSWER!!!!

Why are invasive species considered a threat to native wildlife?

They can breed and spread quickly.
They consume native species’ food supply.
They evolve, and native species don’t.
They all have higher genetic diversity than native species.
They don’t need resources from the environment as native species do.

Answers

They can breed and spread quickly.

They consume native species’ food supply.

They can breed and spread quickly.

They consume native species’ food supply.

Invasive species disrupt the ecosystem.

What are invasive species?Invasive species, also called introduced species, alien species, or exotic species, any nonnative species that significantly modifies or disrupts the ecosystems it colonizes. Such species may arrive in new areas through natural migration, but they are often introduced by the activities of other species.

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What if we lived on jupiter?

Answers

It would be difficult but not impossible. The gas giant has a small rocky core with a mass of 10 times less than earth's but it is surrounded by dense liquid hydrogen to 90% of Jupiter's diameter.

What is one evolutionary advantage angiosperms have over gymnosperms?

Answers

 Angiosperms contain both seeds and flowers, while gymnosperms only contain seeds. 

Answer: The one evolutionary advantage of angiosperm over gymnosperm is the pressence of flowers. The pressence of flower makes it most successful among other plant group. The pressence of flower in the plant makes plant look more attractive and attracts insects for pollination. This property allows better transportation of flower.The more the insects are attracted towards the plant the transportation of seed will be more.





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