Which statement describes what occurs in both animal and plant cells?
a) nitrogen is used for respiration and oxygen is a waste product.
b) oxygen is used for respiration and carbon dioxide is a waste product.
c) nitrogen is used for respiration and carbon dioxide is a waste product.
d) carbon dioxide is needed for respiration and oxygen is a waste product.

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?

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?