Animal Evolution

Animal animal evolution and paleontology. Animal evolution the theory that modern animals are the modified descendants of animals that formerly existed and that these earlier forms descended from still earlier and different organisms.

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A notochord is a rigid rod that runs the length of the body.

Animal evolution. A giraffe neck contains seven elongated vertebrae and for blood to reach the brain the heart must pump it to a height of two metres a feat made possible by an unusual heart structure blood pressure more than twice that of humans and thick walled blood vessels. Animals are multicellular organisms that feed by ingestion of other organisms or their products being unable to derive energy through photosynthesis or chemosynthesis. Another major step in animal evolution was the evolution of a notochord.

There are many competing hypotheses for the form of the evolutionary tree of animals. In the early stages of development animals species look the same. It has a short base and two main branches.

After dinosaurs pterosaurs and marine reptiles vanished off the face of the earth 65 million years ago the big theme in vertebrate evolution was the rapid progression of mammals from small timid mouse sized creatures to the giant megafauna of the middle to late cenozoic era including oversized wombats rhinoceroses camels and beavers. Animal evolution the study of fossils help trace back the evolution of animals 17 05 16 how did the giraffe get its long neck. This selection acts continuously on many levels and time scales.

It supports the body and gives it shape see figure below it also provides a place for muscles to anchor and counterbalances them when they contract. The evolutionary tree in animals. Thus an animal may become well adapted to an ecological niche that then disappears forcing the animal either to evolve rapidly to fill another or more likely to become extinct.

Symmetry body cavity tissue and vertebral column. All the adaptations in the living world have been produced by natural selection. There are four main characteristics that are used to classify animals.

A traditional hypothesis is that the tree resembles a tuning fork.

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