Which of the following groups of animals have a partially open, fluid filled body cavity which develop from the first formed embryonic cavity blastocoel?
A
Flatworms
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B
Earthworms
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C
Roundworms
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D
Shipworms
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Solution
The correct option is C Roundworms Roundworms are pseudocoelomate animals. The body cavity develops from the blastocoel and is not completely lined by the mesoderm.