What is the earliest life form on Earth?
Correct answer: D. None
- A. Virion
- B. Viroid
- C. Prion
- D. None
Explanation
The correct answer is 'None' because the earliest forms of life on Earth were primitive single-celled organisms, such as prokaryotes. These microbes, which include bacteria and archaea, are considered living organisms because they meet the criteria of life, such as metabolism and reproduction. In contrast, virions, viroids, and prions do not possess all the characteristics required to be classified as living organisms. They cannot reproduce independently and lack cellular structure, which disqualifies them from being considered the earliest forms of life.
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About Evolution
Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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