Body cavity not lined by mesoderm and directly connected to archenteron occurs in
A
Platyhelminthes
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B
Nematodes
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C
Earthworm
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D
Echinoderm
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Solution
The correct option is B Nematodes
Option (B) Nematodes
Nematoda consists of the nematodes. They are characterized by their long, thin, tube like appearance that lacks a visually distinct head or tail. Nematides exist as free living organisms in terrestrial and aquatic environments.