when two frog species, rana pipiens and rana sylvatica, mate, the offspring die early in embryonic development. this is an example of .

Transpiration is the evaporation of water from

During a hot day, warm and moist air rises and cools in the atmosphere. which even would occur next on such a day? a. condensed droplets would gather to become water vapor. b. water vapor would condense into tiny droplets. c. water droplets would evaporate to form rain and snow.

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.