#Question id: 4632
#Unit 11. Evolution and Behavior
Which of these conditions should completely prevent the occurrence of natural selection in a population over time?
#Question id: 4633
#Unit 11. Evolution and Behavior
Natural selection is based on all of the following except
#Question id: 4634
#Unit 11. Evolution and Behavior
Which of the following represents an idea that Darwin learned from the writings of Thomas Malthus?
#Question id: 4635
#Unit 11. Evolution and Behavior
Which statement about natural selection is most correct?
#Question id: 4636
#Unit 11. Evolution and Behavior
Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
1. Well-adapted individuals leave more offspring than do poorly adapted individuals.
2. A change occurs in the environment.
3. Genetic frequencies within the population change.
4. Poorly adapted individuals have decreased survivorship.
#Question id: 4637
#Unit 11. Evolution and Behavior
A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?
A) The amount of available food may have increased.
B) The number of predators may have decreased.
C) The squirrels of subsequent generations should show greater levels of genetic variation than previous generations, because squirrels that would not have survived in the past will now survive.
Choose correct combination,