A gastrovascular cavity is a digestive sac with only a single opening. An alimentary canal has two openings (a mouth and anus) between its digestive tubes unlike the gastrovascular cavity in which food is ingested and eliminated through the same opening.
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Answer:when you need to replace cells that are old lost or broken
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I believe the somatic motor association area is responsible for the coordination of the learned motor responses. The somatic motor association area is also the motor cortex which is a region of the cerebral cortex that helps in planning control and execution of voluntary functions among other functions.
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Human activity can affect the amount of carbon in the atmosphere. When fossil fuels like oil, coal, and natural gas are burned, carbon dioxide is released into the atmosphere as waste.
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