9/8/2023 0 Comments Do sponges havelegss to moveRoundworms are small and can be found everywhere. Just one kind of worm, the roundworm, may have as many as half a million species. Different kinds of worms live in the soil, in the ocean, and as parasites. Worms is a term that describes a huge variety of animals. Coral reefs provide homes for a wide variety of animals in warm, ocean waters. The colonies secrete a stony skeleton, called a reef. The tentacles push food into a body cavity where it is digested.Ĭorals often form large colonies. These animals have tentacles that they use to sting or trap prey. Cnidarians include corals, hydras, and jellyfish. They take in tiny bits of food that they filter from passing water. They lack a head, arms, and legs, and once a young sponge has settled in one spot, it never moves again. The simplest of all of these animals are the sponges. There are different kinds of invertebrates, including sponges, cnidarians, mollusks, arthropods, insects, worms, and echinoderms. Invertebrates depend on other living things for food. Most invertebrates reproduce sexually, meaning male and female invertebrates produce sex cells. Bilateral symmetry, or two-sided symmetry, means that if you were to draw a line down the middle of the animal’s body, the two sides, or halves, would look identical. But some, such as clams and oysters, spend their adult lives anchored, or attached to something solid, like rocks or even the bodies of other animals. Most invertebrates are mobile, meaning they are able to move freely. Other than sponges, cells within invertebrates are organized into tissues, or cells that share a common function. And unlike plant cells, animal cells have no cell walls. Invertebrates share common traits, such as being multicellular, or made of more than one cell. Among animals are those with backbones, or vertebrates, and those without backbones, or invertebrates.
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