Which best explains how photosynthesis is to humans? it reduces the amount of harmful rays released by the sun. it increases the levels of carbon dioxide in the air. it provides oxygen for humans to breathe. it produces proteins, which humans can eat.

It reduces the amount of harmful rays released by the sun.

It increases the levels of carbon dioxide in the air.

It provides oxygen for humans to breathe.

Explanation:

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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.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.