The morphological type adapted to a sedentary or sessile life is the _________,and that adapted for floating or free-swimming existence is the _____________.
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Q17: Cnidarians are widespread in marine habitats,but there
Q18: The most typical habitat of cnidarians is
Q19: Ctenophores,also known as sea wasps,are responsible for
Q20: Some fish eat cnidarians,and then use the
Q21: The nematocyst is enclosed within the cell
Q23: Zooxanthelae
A)fix carbon dioxide and photosynthesize in a
Q24: The structure of the nervous system in
Q25: Coral reefs are limited to areas
A)of shallow
Q26: Sea anemones and corals lack
A)a sexual stage.
B)an
Q27: The ciliated larva of the cnidarians is
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