Answer:
Well for one, a dogs sperm couldn't fertilize a cats egg and vice versa. Their breeding behaviors, heat cycles, and different DNA prevent them from being able to produce healthy, viable offspring.
Explanation:
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The removal of the producers would cause the collapse of the entire food web. Primary consumers or herbivores, which feed on producers directly, would die off.
Answer:
Dopamine, Acetylcholine, Serotonin
Explanation: