Most of earth's usable chemical energy came to earth as solar energy but has been stored as a) fossil fuels. b) nuclear fuels. c) ultraviolet waves. d) geothermal energy.

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

3test questions with answers on incomplete dominance