One similarity between natural selection and genetic drift is that both events

A. are based completely on chance

B. begin with one or more mutations

C. involve a change in a population's allele frequency

D. take place only in very small groups

The following steps describe how sedimentary rock forms at the bottom of a river. Which two steps involve erosion? 1. A large rock breaks down into sediment. 2. The water transports and deposits the sediments. 3.

Which of the following statements is correct? A. The sternum is dorsal to the spine. B. The sternum is posterior to the spine. C. The heart is dorsal to the sternum. D. The heart is posterior to the spine.

Match up the correct receptor type and effect. select one: a. metabotropic; direct opening of an ion channel b. ionotropic; more time required to open an ion channel c. metabotropic; g protein activation leads to activation of a second-messenger d.

What are two ways that some organisms can escape from unfavorable environmental conditions?

What is solar thermal energy used to do? heat homes and power homes heat homes and water heat and power homes and heat water heat homes

Why do clouds tend to form around 3:00 P. M. and 6:00 A. M.?

How does darwin's theory of evolution by natural selection explain why some organisms become extinct?

Definition of control group

What insights did Darwin's voyage provide?

Which fossil would look most like an ancient organism? * trace cast mold?