The atmosphere's variable gases that most influence the greenhouse effect are
a. nitrogen and oxygen
b. argon and carbon dioxide
c. carbon dioxide and water vapor
d. water vapor and ozone

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.

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

Give an example of a trait that is controlled by more than one gene.