Which of the following is an abiotic factor of a desert?
a. cactus
b. sand
c. lizards
d. wildflowers

Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth