Question

why the cosmozoic theory was not accepted​

Answer 1

Answer:

The Theory of Panspermia (Cosmozoa):Life from Outer Space (Interplanetary Theory)The Theory of Panspermia or Theory of Cosmozoa wasproposed by Richter in 1865 and supported by Arrhenius(1908) and the molecular biologist, J.D./Watson, of theDNA fame.The Cosmozoa Hypothesis proposed that life was "brought"to the primitive earth from cosmic bodies (in meteorites orin spaceships). The primitive bacteria arid othermicroorganisms "arrived" here as spores transported bymeteorites. Finding fertile soil here, they grew and thenevolved into the various existing forms. The theory is alsocalled theory of panspermia or spore theory.It further assumes that the spores of organisms areresistant and are not affected by the great amounts ofheat, cold, radiation that a meteorite encounters when ittravels in space.

3. Among meteorites investigated by scientists for signsof life are the carbonaceous chondrites. They arerocks containing 1 to 2% carbon by mass. Fragmentsof chondrites, believed to be 4.5 billion year-old, werecollected from southern Australia in 1969. They contain more than 80 amino acids. Some of them aresimilar to those produced in Urey-Miller apparatus(Fig. 23.8). They are not contaminated by amino acids of the earth because they contain equalamounts of D (dextro) and L (levo) isomers. Amajority of organisms on Earth make use of only Lisomers. Therefore the amino acids which reached theEarth through meteorites like chondrites, could haveadded to the "primitive broth". However, they contributed very little.This theory assumes that life exists elsewhere in the Universe. It explains only the appearance of life one Earth. It does not explain its origin. It does not also explain how life could have originated else-where.

4. This theory states that “the origin of organisms in the earth comes from “life spore” that comes from the outer spaces”.

5. The condition of the outer spaces is drying with very cold temperature and the presence of radiation. The condition like this causes organisms can’t survive. Finally “life spore” arrives to the earth

6. This theory can’t accepted by many people.

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