Students are observing an aquatic plant. They understand that the bubbles they see rising from the cut stem of the plant are the gases produced
during photosynthesis. Which of the following observations is the best
evidence that light is the source of energy for photosynthesis? *

explanation:

the answer for this question would be d. glaciers

i don't know. if i were you, i would search it up online : d

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.