What reactants (molecules) are required for cells to carry out cellular respiration

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.