-
The earth is about 4.6 billion years ago
-
4.4 billion years ago the earth cooled and water condensed
-
Life originated in the oceans between 3.5 and 3.9 billion years ago
-
Earyiest rocks are dated at 3.9 billion years ago
-
The theory of spontaneous generation was widley accepted untill the later 1800's when it was disproved by louis
-
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
-
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.
-
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.
-
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
-
American biochemist sindey fox produced pro to cells by heating solutions of amino acids
