Which of the following has mesoderm but no coelom?
A
Flatworm
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B
Earthworm
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C
Roundworm
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D
Hirudo
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Solution
The correct option is A Flatworm When the animal does not possess body cavity it is called acoelomate condition. The animals which are belonging to Platyhelminthes are acoelomate. They do not have body cavity. These are elongated and flattened worms. These are bilaterally symmetrical animals. The body organs and the parts are made up of the three germ layers called as the ectoderm, mesoderm, and endoderm.