Is the process by which ally frequencies change within a gene pool due to change or random events.
a. emigration
b. gene flow
c. genetic drift
d. macroevolution

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Which of these is not a nucleotide base found in dna?

Which of the following explains why a tree is often used as a model to represent the principle of common descent