How is upwelling important for marine organisms?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

20 the compound al(nh3)2 has atoms of nitrogen.