Question

why fo crabs walk in only sideways direction​

Answer 1

There legs are like that. They can't produce forward movement like our legs. They only move from right to left and left to right. So yeah, for moving crab moves sideways. Pretty Funny :)

Answer 2

Answer:

Crabs have a wide, flattened shape that makes it easy to borrow into sand or squeeze into narrow crevices, but also restricts the range of motion at the shoulder joint of the leg. This joints are simple hinges like our knees, and they only bend sideways

Explanation:

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