Starting in 1945, nets designed to catch the biggest salmon were used in the Pacific Northwest. As a result, the smaller salmon had an advantage and had a better chance of survival. The small salmon survived to pass on their genes to succeeding generations.
Which type of natural selection is at work here?
directional selection
disruptive selection
stabilizing selection
Directional selection increases the frequency of individuals expressing one of the extreme phenotypic traits in a population. Otion A). Directional selection is working here.
What is Directional Selection?
Directional selection is one of the different types of natural selection.
It increases in the proportion of individuals with an extreme phenotypic trait.
It causes a decrease in the number of individuals expressing intermediate phenotype, and the other extreme phenotype.
This selection presents more frequently in those cases in which interactions between living organisms and the environment modify in the same direction.
In the exposed example,
There was an original wide range of salmon sizes.
One extreme phenotype is the largest fishes, and the other extreme phenotype is the smaller fishes.
The largest phenotype was the one affected by the fishing pressure.
The smallest fishes survived.
The alleles coding for the small size phenotype increased the species' fitness, so natural selection favored this extreme phenotype.
Small-sized fishes were favored over medium and large-sized fishes.
Directional selection is working here.
You will learn more about directional selection at
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It is accurate to state that chronic fatigue syndrome is
With regards to the ratio of the gender of neurasthenia, which is known to be a 19th century ailment, and chronic fatigue syndrome, which is a 20th century illness, it is accurate to state that both circumstances were identified commonly in women than men.
Mrs. milio, age 60, was diagnosed with glaucoma 12 years ago and regularly instills miotic eye drops to control her glaucoma. glaucoma is caused by:
Living organisms do not have the potential to adapt and develop into new life forms, or species.
Dark energy is an unexplained force that is causing _____.
Answer:
The given blank can be filled with expansion of the universe to accelerate.
Explanation:
Dark energy is the term given to the force, which is considered to be the reason behind the expansion of the universe. It is a theoretical form of energy, which is believed to function against the gravity and covers the whole of the universe, and is responsible for the majority of the energy present in it and is making its expansion to accelerate.
Dark energy was discovered by the astronomers in the 1990s and is the reason behind the expansion of the universe as it ages. It is found that this energy comprises approximately 70% of all the energy and matter in the universe.
In 1900, there were approximately 1.75 billion humans on earth; in 1950, there were approximately 2.3 billion; in the year 2025, approximately 8 billion people will inhabit the biosphere. in the period between 1900 and 2025, what has happened to the human population?
The standard classification system used by biologists today groups and classifies organisms on the basis of similar physical traits. this system was first developed by carl linnaeus. at the time of his work, there were other methods for grouping organisms that were based on similar habitats, similar diets, or similar behaviors. why is linnaeus's system the most useful one to biologists today?
The Linnaean classification system, developed by Carl Linnaeus, provides a structured way of categorizing life based on shared physical traits, reflecting genetic and evolutionary relationships.
The standard classification system used by biologists today is rooted in the work of Carl Linnaeus, who developed a method based on the grouping of organisms with similar physical traits. This Linnaean classification system is valuable because it provides a structured and hierarchical way of categorizing life, from the kingdom level down to the species. It emphasizes the sharing of obvious physical, or morphological, traits among organisms, which often reflect underlying genetic relatedness and evolutionary history. The system serves as the basis for understanding biodiversity and the relationship between different organisms, much like Mendeleev's periodic table for understanding atomic structure in Chemistry.
Which organelle is the primary site of atp synthesis in eykaryotic cells?
Nitrogen fixation can be accomplished naturally either by a lightning strike or by
a. nitrogen fixating bacteria
b. denitrifying bacteria
c. the harbor bosch process
d. burning fossil fuels
Answer:
The correct answer will be option-A.
Explanation:
The nitrogen cycle is a description of the process and the changes that represent the movement of nitrogen in different spheres of the earth.
The first phase of the nitrogen cycle is the nitrogen fixation which represents the pathway of how atmospheric nitrogen is converted into the nitrogen forms. It is done in three ways: electrical lightning (8%), Harbor process and the nitrogen-fixing bacteria.
Nitrogen-fixing bacteria converts 92% of the atmospheric nitrogen to various nitrogen forms like ammonia. They are the only living organism which has the ability to convert atmospheric nitrogen to a usable form.
Thus, option-A is the correct answer.
Which of the food ingredient is important for brain development? glucose dha folic acid sucrose?
The portion of the mass that changes from day to day, dependent upon the feast celebrated, is called:
The initial step when admitted to jail is:
The pancreatic hormone that raises blood glucose concentration is ________
If a company developed a way to modify a person’s DNA to guarantee certain attributes in offspring, should that company be forced to make their technology available to everyone who wanted it? What are some of the ramifications of widespread use of this type of genetic engineering technology on humankind?
Answer:
Ha Ha that just made my day xD
Explanation:
The nurse is assessing a 10-month-old infant during a checkup. which developmental milestones would the nurse expect the infant to display? select all that apply.
A 10-month-old infant should display several developmental milestones such as the ability to wiggle and crawl, sit unsupported, pick up objects with a pincer grasp, babble similarly to speech patterns, and exhibit stranger anxiety.
The nurse assessing a 10-month-old infant during a checkup would expect to see several developmental milestones indicative of the infant's growth and progress. At this age, the infant should be able to wiggle and crawl, which is crucial for developing gross motor skills. Additionally, the infant is expected to sit unsupported, showcasing increased muscle strength and balance.
Moreover, these infants typically demonstrate advances in their cognitive and fine motor skills. This is evident through their ability to look for a dropped toy, indicating the development of object permanence. They should also be able to pick up objects with a pincer grasp, which involves using the tips of the thumb and forefinger, an important fine motor skill allowing them to handle smaller objects.
From a language development perspective, a 10-month-old infant often babbles in a manner that starts to mimic the cadences of actual speech, reflecting burgeoning communication skills. In terms of social and emotional milestones, infants at this age may exhibit fear or anxiety around strangers, known as stranger anxiety, which is a normal stage of development.
What are the main factors that influence blood alcohol concentration (bac)? (select all that apply)?
Answer:D. All of the above
Explanation:
Fill in the blanks. A food ____ is a diagram of the energy transfer among organisms in an ecosystem. A food ______ is an illustration of how the chains are interconnected.
first answer is chain
second answer is web
The first blank can be filled with chain and the second blank can be filled with web.
The food chain shows the link between the organism, what they eat and are eaten by whom. It is a diagram, which shows the flow of the energy from one organism to another by consumption of the organism. There are many organism, which can eat variety of food and can be eaten by many organism, together they form inter connected food chains, which is known as food web. In other words, food web is interconnected food chains.
A neuron that has as its primary function the job of connecting other neurons is called a(n) ______
The neurons whose function is to connect other neurons is called an interneuron.
What is the primary function of an interneuron?Interneurons are found primarily in the central nervous system and they connect one neuron to another. The primary function of the interneurons is to receive and send signals to other neurons They help in the transmission of nerve impulses
Neurons are classified as sensory, motor, and interneurons. The interneurons receive signals from the sensory neurons, interpret the information from other neurons, and send impulses to the motor neurons.
When an electrical impulse is triggered from a neuron, there is a release of neurotransmitters in the synapse. These neurotransmitters cross the synapse and bind to the receptors which further process the message.
To learn more about the interneurons, refer to the link:
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Although the exact definition of a species for prokaryotes is debated, two individual bacteria can often be considered members of a single species if they
Which of the following devices or techniques might be used to identify the presence of human remains?
Cadaver dogs
Ground penetrating radar
Aerial photographs
All of the above may be used.
Answer: All of the above may be used.
Explanation:
Cadaver dogs: Cadaver dogs are the dogs which used to locate or detect the human remains from a region where they are expected to be found. This is due to the brilliant sensing ability of these dogs which helps the police department to find blood, placenta, partially degraded human remains buried in the soil.
Ground penetrating radar: The GPR system can be useful in detecting the buried remains inside the soil by using a radar system of landslide or avalanche victims.
Aerial photographs: The aerial photograph can be obtained from the entire suspected land any bones and entire skeleton can be identified or recovered by this approach.
On the basis of the above explanation all of the above may be used to identify the presence of human remains.
Memories before age _____ are often unreliable.
Final answer:
Memories before the age of three are often unreliable due to childhood amnesia, and while hyperthymesia shows some can remember almost everything from a very young age, it is extremely rare. Memory reliability increases with age, but all memories can be impacted by psychological factors like bias and transience.
Explanation:
Memories before age three are often unreliable. This uncertainty in early memories is linked to a phenomenon known as childhood amnesia, which is the inability of adults to retrieve episodic memories from the first few years of life. Additionally, the concept of hyperthymesia, which refers to an individual's extraordinary ability to recall life events, is exceedingly rare. Studies suggest that memory reliability increases as one ages, though certain traumatic events or significant flashbulb memories, such as national incidents, can still be subject to inaccuracies, regardless of the person's age at the time.
The reliability and accuracy of memories can also be affected by psychological factors, such as bias, which can distort recollections. Childhood experiences can be more accurately remembered if they are verbally rehearsed or socially shared, enhancing the connection between past and present. However, memories can fade or alter over time through natural processes known as transience, or they can be affected by biases that shape our present-day beliefs and feelings.
What is true about the overbooking of hotel rooms?
Overbooking optimizes revenue, mitigates risk, and relies on compensation policies, accurate forecasting, and technology to manage guest experiences effectively.
Overbooking of hotel rooms is a common practice in the hospitality industry to maximize revenue. Here's what's true about it:
1. Revenue Optimization: Hotels overbook to ensure maximum occupancy and revenue, as some guests may cancel or not show up, leaving rooms empty.
2. Risk Management: Overbooking helps mitigate the risk of potential revenue loss due to cancellations or no-shows by ensuring rooms are consistently occupied.
3. Compensation Policies: Hotels typically have compensation policies in place for guests who are affected by overbooking, such as offering alternative accommodations or monetary compensation.
4. Customer Experience: While overbooking can lead to inconvenience for guests, hotels strive to minimize disruptions by offering suitable alternatives and compensations.
5. Technology and Forecasting: Advanced booking systems and data analytics help hotels forecast demand accurately, reducing the likelihood of overbooking situations.
Overall, overbooking is a strategic practice aimed at optimizing revenue while managing the inherent risks in the hospitality industry.
Which of the following is a difference between food chains and food webs?
Food webs contain both plants and animals, but food chains contain only plants.
Food webs separate organisms by trophic level, but food chains do not.
Food chains show energy flow in an ecosystem, and food webs do not.
Food chains are linear, while food webs are complex.
Answer:
Option D, Food chains are linear, while food webs are complex.
Explanation:
A food chain is a linear organization in which the producer lies at the first stage followed by consumer organisms lying at primary, secondary and tertiary stages of food chain.
While in a food web, there can be several interlinked food chains or there can be an organism within the food web which is part of several food chains at an instance. Hence, the linearity of organization cannot be retained in case of food web thereby making it more complex than the food chain.
Hence, option D is correct.
Skeletal muscle fibers with the greatest endurance rely on ________ for energy.
The primary function of the cell's membrane is to: provide support and shape prevent chemicals from entering the cell prevent chemicals from leaving the cell selectively permit or restrict substances from entering or leaving the cell
what are 5 organelles are found in ALL cell types?
The function of the heart is to move ____ blood from the venous system through the right heart into the _____ circulation and to move ____ blood from the pulmonary circulation through the left heart into the ____ circulation.
Reporter: "Excuse me, may I interview you?"
Man: "Yes!"
Reporter: "Name?"
Man: "Abdul Al-Rhazim."
Reporter: "Sex?"
Man: "Three to five times a week."
Reporter: "No no! I mean male or female?"
Man: "Yes, male, female... sometimes camel."
Reporter: "Holy cow!"
Man: "Yes, cow, sheep... animals in general."
Reporter: "But isn't that hostile?"
Man: "Yes, horse style, dog style, any style."
Reporter: "Oh dear!"
Man: "No, no deer. Deer run too fast. Hard to catch."
What are slight attractions that develop between oppositely charged regions of nearby molecules are called?
What is the general term for the layers of tough membranes that cover and protect the brain and spinal cord?