During solstice, around june 21 each year, people in the northern hemisphere can expect

a. only 5 hours of sunlight.
b. a long day of sunlight.
c. 12 hours of sunlight.
d. no sunlight

What food can provide the body with a quick source of the energy needed to carry out cell functions (a) whole grain bread (b) ground hamburger (c) vegetable oil (d) whole milk

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

All phases of matter may have a fixed mass