When scientists compare molecular clocks between species, they have to use the same segment of DNA. Which of these statements would explain why that is necessary?
A.
Not every segment of DNA mutates
B.
Different genes mutate at different rates.
C.
Species accumulate neutral mutations at random rates.
D.
All mutations cause harmful effects.

The first amino acid of a new polypeptide chain is

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs