Why might a species' "optimal" phenotype remain unchanged for long periods of time, resulting in apparent evolutionary stasis? a. directional selection b. habitat tracking c. gradual environmental change d. saltational evolution e. passive trends

Habitat tracking

Explanation:

The organism change their habitat based on the type of environment they are living in. The climate change so did the habitat and according to that the biota changed.

The number of species are always changing. As the environment change the resident population move to a place where there is a better suited environment for them.

The optimal phenotype in this case does not changes and this common response is called habitat tracking.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."