Un proiect despre animale la engleza în limba engleza.
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Animals (also called Metazoa) are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, can move, can reproduce sexually, and develop from a blastula (a globular embryonic stage with cells arranged in a single layer). More than 1.5 million species of living animals have been described—about 1 million of which are insects—but it has been estimated that there are more than 7 million animal species in total. The animal kingdom ranges from 8.5 micrometers to 33.6 meters in length. They have complex interactions between themselves and their environments, forming complex food webs. The kingdom Animalia includes humans, but in colloquial usage the term animal often refers only to non-human animals. The scientific study of animals is known as zoology.
Animals (also called Metazoa) are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, can move, can reproduce sexually, and develop from a blastula (a globular embryonic stage with cells arranged in a single layer). More than 1.5 million species of living animals have been described—about 1 million of which are insects—but it has been estimated that there are more than 7 million animal species in total. The animal kingdom ranges from 8.5 micrometers to 33.6 meters in length. They have complex interactions between themselves and their environments, forming complex food webs. The kingdom Animalia includes humans, but in colloquial usage the term animal often refers only to non-human animals. The scientific study of animals is known as zoology. Most species of living animals are in the Bilateria, a clade whose members have a bilaterally symmetrical body plan. The bilaterians include the protostomes—in which many groups of invertebrates are found, such as nematodes, arthropods, and molluscs—and the deuterostomes, which contain both the echinoderms and the chordates, the latter containing the vertebrates. Life forms interpreted as early animals were present in the Ediacaran biota of the late Precambrian. Many modern animal lineages became clearly recognizable in the fossil record as marine species during the Cambrian explosion, which began about 542 million years ago. 6,331 gene clusters common to all living animals have been identified; they may have arisen from a single common ancestor that lived 650 million years ago. Historically, Aristotle divided animals into those with blood and those without. Carl Linnaeus created the first hierarchical biological classification for animals in 1758 in Systema Naturae, which Jean-Baptiste Lamarck expanded into 14 phyla by 1809. In 1874, Ernst Haeckel divided the animal kingdom into multicellular Metazoa (now synonymous with Animalia ) and protozoa, unicellular organisms that are no longer considered animals. In modern times, the biological classification of animals relies on advanced techniques such as molecular phylogenetics, which are effective in demonstrating evolutionary relationships between taxa. Humans use other species of animals for food (including meat, milk and eggs), for materials (such as leather and wool), as pets, and as working animals, including transport. Dogs were used for hunting, while many land and water animals were hunted for sport. Non-human animals have appeared in art since ancient times and are featured in mythology and religion.