All animals are highly specialized, and go through distinct development, either Metamorphosis or gradual development. They reproduce sexually with Oogamy (distinct egg and sperm).Their organ systems are made up of organs which are made out of different tissues made up of tiny cells. There are two ways to classify animals; they're either vertebrates or invertebrates. Vertebrates have backbones and one phylum, invertebrates don’t have a backbone but have many different phylum. All animals are heterotroph which means they must ingest other organisms or living things.
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