A(n) is a characteristic arising from genes located on gender-determining chromosomes.

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.

Variety of living organisms; includes genetic, species, and ecological types.

Which of the following typically characterizes a tropical rainforests