What event gave Darwin the idea for his theory of Evolution?

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.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

In which of the following relationships is one organism always benefited while the other organism is always harmed