The topography of each basin determines the area that it drains and whether that water exits into...
a. The Gulf of Mexico and the Pacific Ocean
b. The Gulf of Mexico
c. The Atlantic Ocean
d. The Atlantic Ocean and the Gulf of Mexico

chemical because it warmed up which involves temperature and it bubbled which includes changing

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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.