Decide which structure is used in the following sentences.
frogs belong to the amphibian family. they have vertebra and their skin is smooth and shiny. in addition, they are cold-blooded and breathe through their skin. all of these traits make them amphibious.

What are genotypes? what are phenotypes?

Plz ! ive been stuck on this forever

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.