How would cellular respiration be impacted in the absence of photosynthesis? (3 points) Only aerobic respiration would take place. Only anaerobic respiration would take place. Fewer ATP would be produced during cellular respiration. Both reactants of cellular respiration would not be available.

## Step 1<br />Cellular respiration is a process that all living organisms use to produce energy from glucose. This process requires oxygen and produces carbon dioxide as a byproduct. The glucose used in cellular respiration is produced by photosynthesis, a process that is unique to plants and some algae.<br /><br />## Step 2<br />If photosynthesis were to stop, the production of glucose would also stop. This means that there would be no glucose available for cellular respiration to use as an energy source.<br /><br />## Step 3<br />Without glucose, cellular respiration cannot take place, regardless of whether it is aerobic (requiring oxygen) or anaerobic (not requiring oxygen). This is because glucose is the primary source of energy for cellular respiration.<br /><br />## Step 4<br />Therefore, the absence of photosynthesis would mean that both reactants of cellular respiration (glucose and oxygen) would not be available. This would halt the process of cellular respiration, leading to a lack of ATP (adenosine triphosphate), which is the energy currency of the cell.