Select the statements that describe brain injuries. Brain injuries only affect the brain.

Brain injuries can occur when the brain’s oxygen or glucose supply is interrupted.

Brain injuries can only be caused by physical trauma.

Brain injuries can be caused by infection or intoxication.

i think the answer would d

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

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.