Which of the following types of organisms first evolved about 1.5 billion years ago?
Correct answer: C. Eukaryotes
- A. Prokaryotes
- B. Animals
- C. Eukaryotes
- D. Seed plants
Explanation
Eukaryotes are organisms that have cells with a nucleus and other membrane bound organelles. The origin of eukaryotes is still a matter of debate, but it is generally believed to have occured around 1.5 billion years ago. Thus, option C is correct.
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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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