What Metaphor in the World can you use to Describe this part of the Cell?

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.

Collin would like to use the data a coworker has entered in a database. the problem is the coworker's database software is different from collin's. collin should

What is a general feature of a species that varies from one individual to the next (skin tone,eye color or hair color)? a.organism b.trait c.character