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earth born
The earth is about 4.6 billion years ago -
earth
4.4 billion years ago the earth cooled and water condensed -
Life on earth
Life originated in the oceans between 3.5 and 3.9 billion years ago -
evidence
Earyiest rocks are dated at 3.9 billion years ago -
louis pasteur
The theory of spontaneous generation was widley accepted untill the later 1800's when it was disproved by louis -
theory of Jean lamarck
In the early 1800's the french scientist Jean Lamarck presented a theory of evolution called the theory of use and disuse. Lamarck thought that organisms were able to develop new structures b/c they needed the structures -
August weismann
The idea that acquired traits could be inherited was officially disproved in the late 1800's by the experiments of August. Weismann cut off the tails from mice. He then mated the tailless mice. -
Darwin's theory
In the 1850's the theory of natural selection was proposed by the englishman Charles Darwin. In his travels he noticed that a certain species in one geographic area was different fomr the same species in another area. His theory of evolution was developed to explain the gradual change in species. -
Hugo deVries
In 1901, a scientist named Hugo suggested that inherited mutations caused variations. He believed that mutations occurred randomly and those mutation that were favorable were inherited by offspring -
Biochemists
American biochemist sindey fox produced pro to cells by heating solutions of amino acids
