Greenhouse gases include carbon dioxide and methane. How do greenhouse gases act to increase air temperatures near Earth's surface? A. They transmit visible light that enters the atmosphere.
B. They trap heat that is radiated from the surface.
C. They reflect heat that enters the atmosphere.
D. They emit heat when they undergo chemical reactions.

B, They trap heat that is radiated from the surface.

Explanation:

Greenhouse gases are more complex than other gas molecules in the atmosphere, with a structure that can absorb heat. They radiate the heat back to the Earth's surface, to another greenhouse gas molecule, or out to space. There are several different types of greenhouse gases.

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).