What happens when an atom loses an electron from its outermost shell?
a. it becomes a positive ion.
b. it becomes an isotope.
c. it bonds with another atom.
d. it becomes a negative ion.

Theories basic to all of the life sciences include the germ theory of disease. theory of evolution by natural selection. o two of these answers are correct none of these answers are correct o cell theory.

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.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?