Animal taxonomists classify animals according to their various characteristics (morphology, cell, heredity, physiology, ecology and geographical distribution, etc.). ) and divide it into six main grades, namely, phylum, class, order, family, genus and species.
Scientists have also discovered more than 654.38+300,000 species of invertebrates. Most of these animals are insects, most of which are beetles. Slugs, earthworms, squid, oysters, red starfish, jellyfish, spiders, corals, radiolarians, roundworms, pork tapeworms, worms, snails and slugs all belong to invertebrates.
Extended data:
First, the morphology of insects.
The body of this insect is divided into three parts: head, chest and abdomen. Adults usually have two pairs of wings and six legs, the wings and feet are located in the chest, and the body consists of a series of segments, which are further assembled into three segments (head, chest and abdomen). There are a pair of antennae on the head, and the bones are wrapped outside the body; Life forms have changed a lot, all over the world. It is one of the most diverse arthropods.
Second, the basic habits of animals
Animals are a large group of multicellular eukaryotes, known as the animal kingdom. The basic forms of animal bodies will become fixed during their development, usually as early as embryonic development, but some will undergo deformation in later life.
Most animals are active. They can move spontaneously and independently. Most animals are consumers, and they depend on other organisms (such as plants) for food. However, a few animals belong to decomposers-they feed on dead organisms (organic matter) (such as earthworms).
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