Why are experimental set-ups important in scientific investigation?
A Experiments produce data help support ideas.
B Experiments produce new ideas to explain a natural phenomenon.
C Experiments can help make predictions.
D Experiments will answer all questions in science.

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.