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B
Other planets
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C
Pre-existing life
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D
Spontaneously
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E
Chemicals
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Solution
The correct option is A Non-living Abiogenesis is the process by which a living organism arises naturally from nonliving matter. According to Cosmozoic theory, life has reached this planet Earth from other heavenly bodies such as meteorites, in the form of highly resistant spores of some organisms. It is not related to abiogenesis. Abiogenesis does not explain about preexisting life. Chemical evolution theory is also known as Materialistic Theory or Physico-chemical Theory. According this theory, Origin of life on earth is the result of a slow and gradual process of chemical evolution that probably occurred about 3.8 billion years ago. Spontaneous generation theory assumed that living organisms could arise suddenly and spontaneously from any kind of non-living matter.