The fight-or-flight response in humans is activated by epinephrine, a hormone secreted by the glands. pituitary thyroid parathyroid adrenal

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

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases