zoology notes for first year
ies. Cnidaria: Animals with stinging cells, e.g., jellyfish, corals. Platyhelminthes: Flatworms, some of which are parasitic. Nematoda: Roundworms, important in ecology and medicine. Annelida: Segmented worms like earthworms. Arthropoda: Largest phylum, including insects, arachnids, crusta