Which phrase best describes the time period in which the current body of scientific knowledge was developed?
A. Just over the last 50 years
B. Throughout all of history
C. Mostly during Roman times
D. Mostly in the 20th century

Answer: D. receive oxygen

Explanation: Breathing is a coordinated effort of various respiratory system organs to receive oxygen and eliminate carbon dioxide. The cardiovascular system works in coordination with the respiratory system to receive oxygen into the blood and remove carbon dioxide out of the blood... PF

Breathing is a coordinated effort of respiratory organs to receive oxygen.

Breathing (or ventilation) is the process of moving air into and from the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen.

All aerobic creatures need oxygen for cellular respiration, which extracts energy from the reaction of oxygen with molecules derived from food and produces carbon dioxide as a waste product.

The breathing of all vertebrates with lungs consists of repetitive cycles of inhalation and exhalation through a highly branched system of tubes or airways which lead from the nose to the alveoli.

Therefore, Breathing is a coordinated effort of respiratory organs to receive oxygen.

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A habitat is the place where a plant or animal lives. All living things have adaptations that help them survive in their habitats. For example, plants and animals can only live in habitats that meet their needs.

An ecosystem is a group of animals and plants and their physical environment. Coral reefs are underwater ecosystems. Coral reefs are made from skeletons of tiny creatures. Deserts are also ecosystems and they get dry weather and very little rain.

The reason why interdisciplinary science is important to society is because of the following reasons; It has incorporate sources of knowledge and it is a way of increasing our knowledge. This science has made people realize and learn more things than they actually know and it made people understand things around them without having to actually think an explanation behind it.

Answer:1. The atmospheric conditions at a particular time.

3. Both apply to a certain region.

4. model

5. Average weather conditions of a region over the long term.

Explanation:

1. The weather can be define as the atmospheric condition of a region for a particular period of time. It can be determined by the amount of sunshine, rainfall and wind the region receives.

3. The weather and climate conditions are both applicable in determining the atmospheric condition of a region. These are two informative aspects of the atmosphere which are measurable.

4. A model is the simulation of a natural processes which occur on earth. This is descriptive and demonstrative approach which can be used to study the cause of a natural event or phenomena and the factors associated with them.

5. A climate can be define as a constant weather condition of a region for a period of atleast 30 years. It can be measured on the basis of wind velocity, precipitation and temperature.

6. A testable scientific question is the one which can be answered using suitable experimental procedures. The data obtain can be used to answer the question.

1. What is better, ice cream or potato chips? - non-testable

2. Which has more nutritional value, ice cream or potato chips?- testable

The first question is non-testable because it cannot be answered scientifically, as it does not include the parameter on which the food items should be compared. The second question is testable because a particular parameter called as nutritional value is to be compared between the two food items.  

Final answer:

Weather is defined as the atmospheric conditions at a specific time, while climate is the average weather conditions over a long period in a region. Both apply to a certain region, and a model is used in science to represent complex processes. Non-testable questions can often be rephrased into testable ones by focusing on observable phenomena.

Explanation:

The best definition for weather is the atmospheric conditions at a particular time. This includes temperature, humidity, precipitation, cloudiness, brightness, visibility, and wind that are experienced at a specific place and time. In contrast, climate refers to the average weather conditions of a region over the long term, which involves a consistent pattern of temperature and precipitation over many years.

What weather and climate have in common is that both apply to a certain region. They are interrelated concepts, with weather describing short-term atmospheric conditions and climate representing the long-term patterns of these conditions.

A concept used to represent a complex idea or process in science is a model. Scientific models help researchers and scientists to simulate and predict phenomena, often involving climate and weather.

Regarding a scientific question that cannot be tested, an example might be 'Why does the universe exist?' This question is based on philosophical or existential inquiry that science is not equipped to test due to its speculative nature. To make it a testable scientific question, one could rephrase it to 'What are the observable phenomena that suggest the origins of the universe?' which can then be investigated using astronomical observations and physics theories.

Increased genetic variation  is an advantage of reproduction. thus option B is correct.

There must be some evolutionary means by which existing DNA sequences are changed and new sequences are incorporated into the gene pools of species is called genetic variation.

It increases chances of survival in the living organisms as some of the variations are acquired genetically due to change in segregation of chromosome during reproduction or due to adaptations these changes will increase the chances of survival of the organism is unfavorable conditions.

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Enzyme activity is highly dependent on temperature and pH. Optimal temperature for human enzymes is usually around 37 degrees Celsius, and deviations can lead to decreased activity or denaturation. Similarly, each enzyme has an optimal pH range, with performance dropping off outside this range due to structure-altering changes in H+ concentration.

The activity of enzymes is greatly influenced by changes in temperature and pH. At their optimal temperature, usually around 37°C for human enzymes, they perform at their peak. Deviation from this temperature can lead to a decrease in activity. High temperatures may cause denaturation, changing the enzyme's structure and preventing substrate binding. Conversely, low temperatures reduce kinetic energy, slowing down reactions.

pH also plays a crucial role in enzyme function. Each enzyme has an optimal pH range where it performs best. For example, enzymes in the stomach, like pepsin, work effectively at a low pH due to the acidic environment. On the flip side, enzymes like trypsin operate in the basic environment of the small intestine. Should an enzyme's environment fall outside its pH range, the change in H+ concentration can alter the enzyme's structure and reduce its activity or even result in denaturation.

Understanding these conditions is critical because enzymes rely on their 3-dimensional shape to function. The noncovalent interactions, such as ionic bonds and hydrogen bonds, that maintain their shape are sensitive to changes in temperature and pH, which can disrupt these forces and the enzyme's activity.

These macromolecules might either be amino acids, proteins or nucleic acids. They are accountable for the chemical changes and reactions that moves largely the cell and its composition. Take for example the cytoplasm of the cell where these organelles are settled. These simple organelles are composed of macromolecules which ignites and catalysis different functions that enables cells, in macro-perspective in motion and metabolism. In intestines for instance, metabolism occurs and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components. 

Answer:

The correct answer will be- fatty acid chains and glycerol molecule.

Explanation:

Lipids are the biomolecules also known as triglycerides.  The lipids get hydrolyzed to provide energy to the body through the process of lipolysis which takes place in the cytoplasm.  

The triglycerides on breakdown form the two components, fatty acids and glycerol in which fatty acid undergo β-oxidation and gets converted to acetyl CoA whereas the glycerol directly enters in the glycolysis pathway as DHAP. The lipolysis provides high energy to the body.

Thus, fatty acid chains and glycerol molecule is the correct answer.

Question:

6 more than X is equal to 33

Answer:

x = 27

*A drug administered by the cutaneous route can have one of these three actions:

Local action, superficial: ex. local anesthetic ...

Deep action: ex. anti-inflammatory action ...

Systemic or general action: ex. anti-anginal action

*The skin is a very effective barrier, which limits the number of drugs that can enter the system.

*The factor influencing the penetration of the drugs are:

- Nature and physicochemical properties of P.A: Molecular weight, hydrophilicity, lipophilicity, stability ...

- Formulation of the drug: Excipients lipophilic, hydrophilic, amphiphilic, an absorption promoter

- Nature and condition of the skin, Location, age, thickness (1 to 8 mm ...), vascularization...

*To not penetrate the skin, a drug should have to be of high molecular mass (to be unable to penetrate through the skin tissue), hydrophilic (since the skin is of a lipophilic nature).

*For example, solar creams should not enter the system so the excipients used are hydrophilic in nature.

You've already got the answer

Final answer:

Habitat loss is most rapid in regions with high human population density, coastal areas, and expanding agriculture regions. The most affected ecosystems are islands, coastal areas, wetlands, and tropical rainforests.

Explanation:

Habitat loss is most rapid in regions with high human population density such as Europe, North America, Asia, the Middle East, Africa, Central America, and the Caribbean. Coastal areas in Asia, Europe, and North America have also experienced severe habitat loss.

The most affected ecosystems include islands, coastal areas, wetlands, regions with large or growing human populations, and emerging agricultural frontiers. Habitat loss has been particularly high in Mediterranean forests, temperate forests, and tropical rainforests.

In addition, areas with limited human densities but expanding agriculture, like the Amazon and parts of Southeast Asia, are experiencing rapid habitat destruction.

The correct answer is option A. They either match up with a receptor molecule on the surface of the cell or enter the cell through the membrane.

The intercellular signals are the signals, which transfer the signals from one cell to the another and the intracellular signals are those signals, which carries message within the cell.

The intercellular signals may or may not be transferred through the gap junctions. The chemical signals are one of the type of the cell signals. The chemical signalling molecules generally have a receptor on the cells, where these molecules can bind and can be cause the activation of the cell. The chemical signals can also enter into the cells through active transport and facilitated diffusion. So, these type of transports does not go through the Gap junction.

The answer to your question is:

They either match up with a receptor molecule on the surface of the cell or enter the cell through the membrane.

Hope this helps....................

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No its a medical condition

Answer:

The diversity index is defined as the measure of diversity that describes the number of species that is present and also the relative abundance of individual species.

The invasive species are those species that are dominant in character and their presence can cause a negative impact on the ecosystem. They have the ability to create dis-balance in an ecosystem. For example, Asian Carp, European Starling, and Water hyacinth.

An increase in the number of invasive species leads to a decrease in the diversity index. This species can alter the food web within an ecosystem by eliminating the local food sources leaving no food for the faunas.

Thus, these species must be kept under control in order to maintain a favorable condition for the other species to exist in an ecosystem.

Answer: B

Explanation: For Lilian to achieve this she needs to build a model train and track, then test the train going round the curve at different speeds intervals. This would help determine at which speeds the train tends to fall off

i believe it is a mass

Answer:

Invertebrate

Explanation:

Snails and insects belong to a group organisms referred to as invertebrate due to the absence of backbone (vertebral column).

In the absence of a watch, an adventurer can use a sundial to estimate time. The sundial uses the property of light to create shadows based on the sun's position. It reflects solar time, which differs throughout the year.

In the given scenario, our adventurer in the jungle could use a sundial to estimate the time accurately. A sundial is an ancient timekeeping device that utilizes the position of the sun to indicate time. It depends on the principle of the earth's rotation and the change in the sun's position in the sky.

The property of light used in creating a sundial is the casting of shadows. As the earth rotates, the sun appears to move across the sky, causing the gnomon (the object which casts the shadow onto the dial) to cast a shadow in a different position on the sundial throughout the day. The position of the shadow on the sundial can then be used to estimate the time with reasonable accuracy, given that the sundial has been correctly aligned with the cardinal directions.

It's critical to remember that a sundial cannot keep time in the same way as a mechanical clock does—the time it displays changes with the sun's apparent position in the sky, which varies with the latitude of the observer, the time of year, and the mathematical equation of time.

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