Recent discoveries of microscopic fossils have extended the known history of life to about:
A)3.5 billion years ago.
B)2 billion years ago.
C)4.5 billion years ago.
D)1 billion years ago.

Question

Quizplus · Accepted Answer

Recent discoveries of microscopic fossils have extended the known history of life to about 3.5 billion years ago, making option A the best choice. Option B is incorrect because it suggests a shorter history of life, while option C represents the age of the Earth itself. Option D suggests a more recent history of life, which goes against current scientific understanding.

Recent Discoveries of Microscopic Fossils Have Extended the Known History