"a sign on the beach states, "beach closed. red tide." the organisms interfering with your use of this beach are probably "

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.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome