I believe the correct answer among the choices listed above is option A. Parasitism is the kind of interaction that is shown here. Parasitism is a kind of relationship where one feed off the other. Fleas here are referred to as the parasite and the dog is the host.
Answer:
Oxygen for respiration and Carbon dioxide for photosynthesis
Explanation:
————C————
Step by step explaintion:
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The answer is D, serving as a primary source of energy for the body.