Answer :
Final answer:
Crabs, part of the crustaceans, have unique characteristics and behaviors such as diverse reproductive strategies and parasitic relationships.
Explanation:
Crabs are crustaceans characterized by a beak and a snout, soft and fragmented bodies that settle on soil by loosening it, fins for swimming and breathing through gills, giving birth to young ones through eggs, having spines on their bodies, and inhabiting both water and land.
Crabs, like the Mediterranean green Crab, are part of the 67,000 species of crustaceans worldwide, with most being decapods with ten legs, possessing two pairs of antennae, mandibles, and biramous appendages.
Crustaceans have diverse reproductive strategies, ranging from laying eggs to incubating them within females. They exhibit various behaviors, including cannibalism and parasitic relationships, with some species like Sacculina spp., which parasitizes and ultimately destroys its crab host.
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