What is/are one source of mineral deposits on the seafloor?

a. coral reefs
b. lagoons
c. seafloor spreading
d. volcanic vents

D. Volcanic vents

Volcanic vents are one source of mineral deposits on the seafloor.

Explanation:

Volcanic vents are openings which are exposed on the earth's surface where volcanic material is discharged or emitted. They originated in the magma chamber which is an underground pool of liquefied rock located underneath the surface of the Earth. They can be found at the on the flanks of a volcano or at the summit of a volcano. It is a source of mineral deposits on the seafloor.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

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.