Answer:
B. The products of photosynthesis are the reactants of cellular respiration.
Producers are where the cellular respiration occur in the biosphere.
<span>The macrophage is the cell responsible for detecting, engulfing and destroying pathogens and apoptotic cells. These cells process and present antigens (foreign materials) to immunocompetent cells and thus they are the key mediators in the development of all immune reactions.</span>
