The world contains a variety of environments, which are mainly created by
a.
natural disasters, like volcanic explosions.
b.
a wide diversity of physical conditions.
c.
similar species of plants and animals.
d.
natural selection and selective breeding.

Melissa lives in a town called greendale. she discovers that when she lights a match and holds it near her kitchen faucet, the little flame grows into a larger fire. melissa is surprised because she thought the water would extinguish the flame rather than ignite it further. her mother tells her that the water might be contaminated with dissolved methane, a primary component in natural gas. melissa investigates the matter and finds that cases of methane contamination started shortly after a company began fracking for natural gas in the area. based on this information, which three statements are plausible consequences of fracking in greendale?

In what for do plants utilize nitrogen? why do they need nitrogen?

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi