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Question:

Documented microfossils have been found that are as old as 2.5 billion years, 3.5 billion years, 1.5 billion years, and 2.5 million years.

2.5 million years.

1.5 billion years.

2.5 billion years.

3.5 billion years.

Solution:

Microfossils are a type of fossil that has a size in the range of 0.001mm and 1mm, the study of which is referred to as micropaleontology. The study of such fossils requires the employment of microscopes - light or electron. The oldest microfossil of bacteria was found 3.5 billion years ago in Quebec, Canada.