What is a cost-benefit analysis? an analysis that weighs the cost of different solutions against the benefits that will result from the solution

a calculation of the amount of land and other resources needed to support one person in one country

an economic principle that states the more demand there is for something with a limited supply, the higher the price will be

an evaluation of how the environment might change if it is impacted in some way

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

most community's take hundreds of years to become stable

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands