Which of the following conditions would lead to a small population size?

a.) a low birth to death ratio

b.) a high birth to death ratio

c.) immigration

d.) large number of resources

Select the correct answer from each drop-down menu proteins are

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d