One of the most selfish things a clever animal can do is cooperating.
Animals are multicellular, eukaryotic entities that belong to the animalian domain of life. Almost all animals have the following characteristics: they ingest organic matter, breathe oxygen, can move, can reproduce sexually, and go through an ontogenetic stage during which their body is formed from a hollow sphere of cells called the blastula during embryonic development. Although it has been predicted that there are more than 7 million animal species overall, about 1.5 million live animal species—of which approximately 1 million are insects—have been described. From 8.5 micrometers (0.00033 in) to 33.6 meters, animals can vary in size (110 ft). Complex interactions between them and their surroundings lead to the formation of sophisticated food webs.
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