Which of the following best states the purpose of villi?

a. speed up the elimination of wastes
b. increase the synthesis of enzymes
(c.) increase surface area for purposes of absorption
d. speed up the loss of water from the body

Which statement is true regarding weathering in dry environments? a) chemical weathering is absent because of a lack of humidity. b) physical weathering is usually more evident than chemical weathering. c) it is impossible to identify the type of weathering that has occurred. d) physical weathering does not play a significant role in dry environments.