Crab-like Evolution: Decoding Carcinization's Trend

TL;DR
Evolutionary trend known as carcinization has led to various species independently evolving crab-like forms. Convergent evolution has resulted in similar features evolving in species from different periods or regions, despite lacking a common ancestor with those features. The advantage of the crab shape includes improved walking, burrowing, and climbing abilities, as well as reduced vulnerability to predators.
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