Why is the dna stage necessary in the retrovirus life cycle?

How does the molecular clock work? a. it analyzes the brain functionality of two different species. b. it examines and compares the physical characteristics of two different species. c. it illustrates relationships between two different species. d. it compares the number of mutations that exist in the dna of two different species.

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment