Invertebrates Educational Facts Children's Science Book

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Invertebrates, which make up the majority of animal species, exhibit diverse life cycles, from immediate maturation after hatching to complex larval stages. They are primarily classified into three groups: insects, arachnids, and crustaceans, each with distinct physical characteristics. A key feature of invertebrates is their circular body plan, lacking a backbone, and many possess a hard outer covering that supports their muscles and helps prevent water loss, showcasing their adaptability in various environments.