The neuromuscular system first evolved in the cnidarians.
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Q1: Digestion in cnidarians is
A)intracellular only.
B)extracellular only.
C)both extracellular
Q2: Compared to the sponges,the radial animals are
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
Q9: The central nervous system of cnidarians includes
Q10: Hydra reproduces asexually by means of
A)buds.
B)nematocysts.
C)gland cells.
D)gametes.
Q11: The freshwater Hydra has a medusa stage
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