Question

Planarians lack dedicated respiratory and circulatory systems. This deficiency does not cause a problem because .

Answer 1

The correct option is (A)  None of their cells are far removed from the gastrovascular cavity or from the external environment.

Why Planarians lack respiratory and circulatory system?

• Although planarians don't appear to have any respiratory or circulatory systems, they do have muscles that line the interior of the body in circular, diagonal, and longitudinal patterns.
• The flatworm doesn't have lungs, therefore it doesn't require a particular circulatory system like a human does to move oxygen throughout its body.
• Through its skin, the flatworm merely diffuses oxygen. Anywhere that it would want oxygen, this happens.
• None of the cells of planarians are a great distance from the gastrovascular cavity or the outside environment, hence they lack specialized respiratory and circulatory systems.

Learn more about the Planaria with the help of the given link:

brainly.com/question/1850129

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