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Helium and hydrogen when combined together with dust make a nebula.
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Nebula is where plants and solar systems are able to form with the perfect condition.
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the theory that the universe began with an explotion of a dense mass of matter and is still expanding from the force of the explotion.
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When the big bang had exploded , diffrent temperatures and climate changed which led a mutation that foced earth to adapt.
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earth revolves around the sun and the solar system.
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Working groups that are proven that the Earth is solid is by showing tectonic plates shifting, coasts eroding, and volcanic eruptions.
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-rise in the concentration of oxygen molecules stops the deposition of uraninites (since they are soluble when combined with oxygen) and starts the depoition of banded iron formations. -The last reserves of reduced iron are used up by the increasing atmospheric oxygen-last banded iron formations
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-eukaryotic cell organisms develop
-rise of multicellular organisms -
Cambrian expolsion of hard bodied organisms.
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Fossils of ediacaran organsims are made
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Fossilization of the burgress shale and fossilization of the chengjiang site.
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k-t boundary--extinction of the dinosaurs. New animals start to form after the exctinction of dinosaurs such as primates and more like prosimians.
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Common ancestor of all primates probably arose before the mass exctinction that closed the Cretadeous period 65 million years ago.
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Species have been classified into two groups: Australopithecus and Homo. Australopithecus have been living for 3 to 4 million years ago.
