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.
At the seashore animals will be from the Animal Kingdom in these phyla. 1  Phylum: Mollusks (Soft-bodied animals that sometimes have a hard shell. 2  Includes: snails, octopus, squid, clams, oysters, and mussels.).3  Phylum: Echinoderms (Often spiny animals, with several arms reaching out from the center of its body. Includes: starfish, sea cucumbers and sea urchins.). 2  Phylum: Arthropods, SubPhylum: Crustaceans. 3  Crabs, lobsters, shrimp, barnacles and many other animals belong to the phylum arthropods. 4  In fact, 75% of all animals belong to the phylum arthropoda (which also includes spiders and insects).