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Analysis of the starlet sea anemone genome has emphasized the importance of sponges, placozoans, and choanoflagellates, also being sequenced, in explaining the arrival of ancestral genes unique to the Eumetazoa. Because they are easy to keep and breed, the fruit fly Drosophila melanogaster and the nematode Caenorhabditis elegans have long been the most intensively studied metazoan model organisms, and were among the first life-forms to be genetically sequenced.

They include fish, amphibians, reptiles, birds and mammals.

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The animal kingdom emerged as a basal clade within Apoikozoa as a sister of the choanoflagellates. Animals are motile, meaning they speed dating commercial eharmony dating move spontaneously and independently at some point in their lives. The digestive chamber has two openings, a mouth and an anus, and there is also an internal body cavity called a coelom or pseudocoelom.

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These include molluscs clams, oysters, octopuses, squid, snails ; arthropods millipedes, centipedes, insects, spiders, scorpions, crabs, lobsters, shrimp ; annelids earthworms, leechesnematodes filarial worms, hookwormsflatworms tapeworms, liver flukescnidarians jellyfish, sea anemones, coralsctenophores comb jelliesand sponges. This was facilitated by the severely reduced state of their genomes, but as many genes, introns, and linkages lost, these ecdysozoans can teach us 2 dating about the origins of animals in general.

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Animals can be divided broadly into vertebrates and invertebrates. Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about million years ago. For instance, inbreeding was found to increase juvenile mortality in 11 small animal species.

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