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Questions and Answers
What is a special characteristic shared by all members of the phylum Echinodermata?
What is a special characteristic shared by all members of the phylum Echinodermata?
- Lack of internal skeleton
- Pentamerous symmetrical body (correct)
- Exclusively freshwater habitat
- Simple digestive system
What is the complex of tubes found in echinoderms called?
What is the complex of tubes found in echinoderms called?
- Excretory ducts
- Respiratory network
- Digestive canals
- Water vascular system (correct)
When did echinoderms first appear in the geological record?
When did echinoderms first appear in the geological record?
- Cambrian, 600 million years ago (correct)
- Jurassic, 150 million years ago
- Cretaceous, 100 million years ago
- Permian, 250 million years ago
How many widely diverse classes of echinoderms survive today?
How many widely diverse classes of echinoderms survive today?
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What is the meaning of pentamerous symmetry?
What is the meaning of pentamerous symmetry?
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What is the main component of the internal skeleton of echinoderms?
What is the main component of the internal skeleton of echinoderms?
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What is the meaning of the name 'Echinodermata'?
What is the meaning of the name 'Echinodermata'?
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What does the term 'test' refer to in the context of echinoderms?
What does the term 'test' refer to in the context of echinoderms?
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What is the reason for the secondary development of pentamerous symmetry in echinoderms?
What is the reason for the secondary development of pentamerous symmetry in echinoderms?
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What is the composition of the calcareous skeleton in echinoderms?
What is the composition of the calcareous skeleton in echinoderms?
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