How old are fossils that indicate the first life forms on Earth?

a. Between 1.2 and 1.5 billion years old
b. Between 2.6 and 2.7 billion years old
c. Between 3.4 and 3.5 billion years old
d. Between 4 and 4.2 billion years old


ANS: C
Bacteria-like fossils have been found in northwest Australia. These are the oldest fossils found to date.
There is additional evidence found near Greenland in the form of carbon residue in some of the rocks
which could represent life as far back as 3.85 billion years ago. Information can be found in the section
Life Probably Originated in the Ocean.

Environmental & Atmospheric Sciences

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