Which role of protists, fungi, and bacteria has the most positive effect on maintaining the plant population in an ecosystem? O if they are found in the gut of animals, they can assist in digestion
They are a major food source for animals
They decompose dead materials, returning nutrients to the soil
They produce about 75 percent of the oxygen on Earth

They decompose dead materials, returning nutrients to soil

Explanation:

You could say life on Earth depends on the protists because they supply us with oxygen, are critical organisms in food chains, and recycle important nutrients for other life forms to use.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

b. lithosphere, asthenosphere, mesosphere   is the answer most likely