Do you recall any vertebrates with external reproductive organs on their dorsal surface? What advantages or disadvantages would this provide?

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

what's the

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project