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In a sea shore, the benthic animals live...

In a sea shore, the benthic animals live in sandy, muddy and rocky substrate and accordinagly developed the following adaptations.
(a) Burrowing
(b) Building cubes
`(c)`Holdfasts/peduncle
Find the suitable substratum against each adaptation.

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In a sea shore, water current restrict distribution of organisms. In streamed areas of ocean, animals are strong swimmer or possess attaching organs such as peduncle, or live under stone, in burrows etc.
Burrowing animals like tubeworm, building cubes and holdfast or penduncle adaptation are found in sandy, muddy and rocky substratum respectively.
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