The organisms that push carbon to the bottom of the ocean are known as what? Why is this important to the ecosystem?

Phytoplankton.

Explanation:

Phytoplankton, which is Greek for "drifting plants" are microscopic, one-celled organisms that drift in the sunlit areas in the oceans and they are key to bringing carbon down into the ocean biological pump from the atmosphere via the process of photosynthesis.

Phytoplankton are super important! They generate about 50% of the atmosphere's oxygen, which is the same amount as all land plants combined. They also form the base of virtually every ocean food web. In short, phytoplankton makes other ocean (and land) life possible.

thinking it would be d not too sure but i think it's right

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.