As the warm air rises through the Troposphere it: a. contracts and cools
b. expands and cools
c. expands and heats
d. contracts and heats

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?