Recognize that all organisms are composed of cells and that many organisms are unicellular and must carry out all life functions in one cell. 3.1.6.A5 Describe basic structures that plants and animals have that contribute to their ability to make or find food and reproduce.
Crabs are crustaceans and all crustaceans belong to the taxonomic domain of Eukarya, which are characterised by having cells with nuclei. Eukarya covers all organisms in the Kingdom Animalia, as well as the Kingdoms Plantae, Fungi and Protista.
a crab of the genus Limulus; horseshoe crab. It is also found on the carapace of crabs and limulus, and on mollusks. Of all these the only member alive at the present time is limulus, or the King-Crab. limulus has two pairs of these, Scorpio as many as six pairs.