Question

HOMEWORK HELP MEDAL AND FAN

The fossil record shows the first form of life was a simple prokaryote called ______________.
A. trilobites
B. cyanobacteria
C. eukaryotes
D. mold

Answer 1

b

Answer 2

cynobacteria

Answer 3

Indeed. The cyanobacteria have an extensive fossil record. The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. This may be somewhat surprising, since the oldest rocks are only a little older: 3.8 billion years old!