Which of the following is an internal stimulus? a When an animal notices a change in seasons.
b When an animal sees a potential mate.
c When an animal is in pain.
d When an animal sees a predator.

Which of the following statements are true chromosomes make up genes

Mutations associated with albinism affect proteins involved in synthesis

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.