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B
Coelom
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C
Archenteron
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D
Haemocoel
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Solution
The correct option is C Archenteron Blastocoel is the fluid-filled central region in blastula. Coelom is the body cavity. The organs formed inside the body cavity grows freely and independent of body wall. Archenteron is the cavity within an embryo at the gastrula stage of development, that eventually becomes the digestive cavity. Haemocoel is body cavity, that contains blood or hemolymph.