NEET BIOLOGY

Detailed explanation-1: -They are now classified into over 30 phyla, from simple organisms such as sea sponges and flatworms to complex animals such as arthropods and molluscs.

Detailed explanation-2: -Major Invertebrate Phyla Biologists currently recognize 35 different phyla within the kingdom Animalia. Many of these phyla are relatively obscure and rare. For example, the phylum Cycliophora contains only one genus of microscopic animals found exclusively on the mouthparts of lobsters.

Detailed explanation-3: -Invertebrates that you may be familiar with include spiders, worms, snails, lobsters, crabs and insects like butterflies.

Detailed explanation-4: -The Invertebrates unit explores six groups of invertebrates-poriferans (sponges), cnidarians (such as sea jellies and corals), echinoderms (such as sea urchins and sea stars), mollusks (such as octopuses, snails, and clams), annelids (worms), and arthropods (such as insects, spiders, and lobsters).