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they are invertebrate animals, they don't have body tissues or an organ, water currents carry food and oxygen to them and carry away they're waste products, water also plays a role in they're reproduction and help transport they're young to new places, adult sponge are attached to hard surfaces underwater, sponge look like a hollow bag with many tiny pores on its surface
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| coral is built by cnidarians, the coral reproduces asexually, hundreds of sponges live among the coral |
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| These worms are flat and as soft as jelly, there are two types of flat worms: parasites and free-living, parasites take food from the organism on which it lives, free-living flatworms does not live on an organism |
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| these worms have long , round bodies, they have a one -way digestive system open at both ends, food enters from the mouth at one end and wastes exits through the annus at the other end |
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| these worms have long rounded bodies made up of a series of rings separated by grooves, they have a digestive tube, a nerve cord and a reproductive system and a circulatory system, by which blood moves through a connected network |
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