The central nervous system of cnidarians includes a brain.
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Q4: Nematocysts are expelled when
A)the osmotic pressure reaches
Q5: All ctenophores are marine,and most of them
Q6: Radial symmetry benefits animals that actively move
Q7: Some nematocysts do not inject poison.
Q8: Nematocysts are found in some cells lining
Q10: Hydra reproduces asexually by means of
A)buds.
B)nematocysts.
C)gland cells.
D)gametes.
Q11: The freshwater Hydra has a medusa stage
Q12: Most of the hydrozoans are colonial marine
Q13: The radiate animals represent the tissue-organ level
Q14: The class of cnidarians with the most
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