How is the frog's respiratory system different from humans?

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.

In what cells is the human genome located?

Matched chromosomes carrying information about the same characteristics in the organism are called