What sentence best supports the statement that hormones are involved in the regulation of homeostasis? A.
The hormone cortisol suppresses the immune system and is produced when the body is under stress.
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 erythropoeitin increases the production of red blood cells when oxygen levels are low.

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases