Which of the following best describes the characteristics that differentiate animals from the organisms of other kingdoms?
Animals have chloroplasts, making them autotrophic
O Animals have external digestion and cell walls
O Animals have eukaryotic cells, are multicellular, and heterotrophic.
O Animals have a unique substance called peptidoglycan in their cell membranes.

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

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.