Question
Why don't flatworms need a circulatory system?
Step 1
Their thin, flat bodies enable them to be in close contact with their environment, allowing for the direct exchange of gases and nutrients between their cells and the surrounding water or moist surfaces. Show more…
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Annelids and cephalopods have a(n) ______________ circulatory system.
$$\begin{array}{l}{\text { (A) Hydra }} \\ {\text { (B) Grasshopper }} \\ {\text { (C) Earthworm }}\end{array}$$ Has no circulatory system
ORGANISMAL BIOLOGY
Animal Physiology
Mention breifly about the circulatory system of earthworm
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