All plants and animals have mitochondria, but only plants have chloroplasts, which enable the formation of chemical energy from light through the same mechanism as in cyanobacteria. The endosymbiosis theory would predict that:.

Plant cells having chloroplasts suggests that they come from a specific species of prokaryotes: cyanobacteria.

Explanation:

The endosymbiosis theory explains that eukaryotic cells (both plant and animal cells) come from a common ancestor: prokaryotes. Chloroplasts and mitochondria have outer phospholipid bilayer membranes and circular DNA molecules like prokaryotes have.

It is believed that ancient bacteria were captured by other cells in the past and thus they became eukaryotic cells.

Cyanobacteria are prokaryotes with the capacity to do photosynthesis as plant cells do.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

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