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Which of the following is not true of echinoderms?
A. life cycle includes motile larvae and sedentary adult
B. they have a tough outer epidermis
C. they have skin gills
D. they have ossicles
E. they are pentaradially symmetrical |
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Definition
B
they actually have a very thin epidermis |
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| on outer epidermis of echinoderms, how starfish take in oxygen |
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| digestive system of echinoderms that may be everted out of the mouth |
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Which of the following is true of echinoderms?
A. are hermaphroditic
B. have sessile larvae
C. exchange water through ossicles
D. have nerve rings
E. have cephalization |
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Definition
D.
have separate sexes, motile larvae, exchange water through madreporite, do not have cephalization |
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Definition
| used to exchange water in echinoderms |
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| how echinoderms circulate sea water and move tube feet |
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| skeleton of echinoderms, calcareous, often spiny |
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| is fertilization of echinoderms internal or external |
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Definition
| sea lilies and feather stars |
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| has a respiratory tree, cloaca, and can eviscerate when disturbed |
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Definition
| holothuroidea (sea cucumbers) |
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