how does a sponge obtain food how does a tapeworm move

Phylum Annelida includes worms with bodies made of segments such as the sandworm, leech and the earthworm. Phylum Nematoda include all the roundworms such as the ascaris, pinworm, hookworm, stomach worm and the trichina or pork worm. The phylum Platyhelminthes include worms with flattened bodies, such as the planarian, tapeworm and liver fluke. There are three different phyla of worms, the Platyhelminthes, Annelida, and Nematoda.

These animals are characterized as having soft body and usually have limy shells. Some examples of mollusks include snails, slugs, scallop, octopus and clams. The phylum Mollusca is made up of animals called mollusks. These animals are characterized by having special stinging organs called nematocysts. The phylum Coelenterata, also called Cnidaria includes animals such as the hydra, jellyfish, sea anemone, and the coral. The phylum Porifera contain animals with pores all over their bodies known as sponges. The phylum Echinodermata consist of a group of animals with external spines, such as the sand dollar, starfish, sea urchin, Portuguese-man-of-war, and the sea cucumber. Due to the large variety of invertebrates, scientists have divided them into seven major groups called phyla. There are more than one million known species of invertebrate and about forty thousand species of vertebrate animals. The scientific name assigned to animals without backbones is Invertebrata, meaning without vertebrae. The vertebral column are made up of small bones called vertebrae.

An invertebrate is an animal without a backbone or vertebral column.

How does a sponge obtain food how does a tapeworm move