during the process of photosynthesis, energy from the sun is converted into; during the process of cellular respiration, energy is released from; photosynthesis and respiration are alike in that they both; which two processes are responsible for keeping the percentage of atmospheric; which process is a form of autotrophic nutrition?; in the leaf of a plant guard cells help to; what is the product of photosynthesis that becomes food for the autotrophs that produce it; the cells of some organisms contain both chloroplasts