2. For the last 200 million years, continents on opposite sides of the Atlantic Ocean have generally
1) been drifting closer together
2) been drifting farther apart
3) remained the same distance apart

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explanation:

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it cools slower in the earth meaning the crystals have more time to form than lava on the surface

"a.) well–developed vascular system."

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.