The first eukarotes appeared about __________ years ago?
Correct answer: A. 1.5 billion
- A. 1.5 billion
- B. 2.5 billion
- C. 3.5 billion
- D. 4.5 billion
Explanation
The earliest widely accepted eukaryotic fossils are approximately 1.5 billion years old, although estimates vary with the fossil evidence used. Eukaryotic cells appeared after prokaryotes and are distinguished by a membrane-bound nucleus and organelles. Students may choose 2.5 billion years because it is also a commonly quoted approximate date for early complex cellular life, but 1.5 billion years is the intended textbook value.
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About Concept of Evolution
Evolution is the heritable change in populations over generations, driven by mutation, recombination, natural selection, genetic drift and reproductive isolation. Questions examine variation, adaptation, survival and reproduction, speciation, fossil and anatomical evidence, and the difference between individual acclimatization and evolutionary change in a population.
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