Which is 1 2 3 or 4 using the choices above

Why do german shepherds shed so much

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.

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?