Practice Quiz

Praxis II General Science

Category - Life Science

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Of the following types of life forms, which was likely to have occurred the earliest?
  1. Bacteria
  2. Reptiles
  3. Mammals
  4. Viruses
  5. Fish
Explanation
Answer: D - Viruses, which lack nuclei and many ‘modern day’ cell parts, are believed to be early precursors to cells. Bacteria likely evolved next, followed by eukaryotic organisms.
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