Animals square measure cellular eukaryotic organisms that kind the biological Animalia. With few exceptions, animals consume organic material, breathe chemical element, square measure able to move, will reproduce sexually, and grow from a hollow sphere of cells, the fertilized egg, throughout embryonic development. Over 1.5 million living animal species are described of that around one million square measure insects but it's been calculable there square measure over seven million animal species in total. Animals direct length from eight.5 millionths of a metre to thirty-three .6 metres (110 ft) and have advanced interactions with one another and their environments, forming tangled food webs. The class includes humans, however, in conversational use the term animal usually refers solely to non-human animals. The study of non-human animals is understood as zoological science.
Humans build use of the many alternative animal species for food, as well as meat, milk, and eggs; for materials, like animal skin and wool; as pets and as operating animals for power and transport. Dogs are employed in looking, whereas several terrestrial and aquatic animals square measure sought for sport. Non-human animals have appeared in art from the earliest times and square measure featured in mythology and faith.

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