Rank the following ecosystems in order of their net primary productivity, from lowest to highest: a) open ocean. b) tropical rain forest. c) desert. d) lake.

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Were does condensation occur? a) hydroshereb) lithosherec) boishered) atmosphere