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This is time when the first single celled organisms originated. For example: bacteria.
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It means "before animal life". Basically, there were existed: bacterias, algae and worm-like creatures.
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Most of the major groups of animals first appear in the fossil record and continues through today.
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"Ancient life"
The livings at that time were relatives of the sponge and trilobites. -
Most of the major groups of animals first appear in the fossil record.
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During this period, there were various marine invertebrates and conodonts (early vertebrates).
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Period of coral reef. Including relatives of spiders and centipedes...
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Ferns, horsetails and seed plants had appeared. Therefore, tehy have formed forests.
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It is characterized of the amniote egg (which allowed the ancestors of birds, mammals, reptiles to reproduce). And also by the increased in large insects and tree ferns.
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During this period, the land continents came together to form Pangaea. This period had a great variety of species.
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"Middle life"
There were dinosaurs, cycads and ferns. -
There were no polar ice caps, and the climate at the equator was hot and dry, punctuated by violent monsoons.
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During this time dinosaurs roamed the Earth and there were various plants like cycads, growth of ferns... And also there were marine species: fish, squid and coiled ammonites.
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The first ceratopsiand and pachycelhalosaurid dinosaurs appeared. And were found many fossils of many species of this period.
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"Recent life"
There were living mammals, birds, flowering plants and ray-finnes fishes. -
This period suffered a big extinction, due to biological changes. Although, there were quite amount of plants, grasslands, insects, teleost fish, birds, and also mammals.
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Mammoths and mastodons, sabre-toothed cats, giant ground sloths, and many other large mammals roamed North America, Asia, and Europe. In this period, ocurred human civilization. Humans still exist today.