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The answer is C respond to stimuli in the environment
Carbon dioxide and water are known as byproducts. Please take note that respiration and photosynthesis are basically the exact opposite of each other. Respiration takes diatomic oxygen or simply O2 from the atmosphere and changes it with carbon dioxide or CO2. On the other hand, photosynthesis takes out CO2 from the atmosphere and changes it with O2.
Eukaryotes have their DNA inside a nucleus while Prokaryotes just have it floating inside themselves