The first life on Earth appeared in water,and evidence indicates that life originated in one of the following eras:

  • A
    Palaeozoic
  • B
    Mesozoic
  • C
    Cenozoic
  • D
    Proterozoic

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The idea that life originates from preexisting life is referred to as:

The concept of chemical evolution is based on which of the following?

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