Recently a news appeared in the newspapers that the a Human Sperm gene called “Boule gene” has remained unaltered since 600 million years from development of insects till humans.

Recently a news appeared in the newspapers that the a Human Sperm gene called “Boule gene” has remained unaltered since 600 million years from development of insects till humans.
Which among the following era represents the 600 million years back time on Geological time scale?
[A]Paleozoic Era
[B]Mesozoic Era
[C]Neo-proterozoic Era
[D]Meso-proterozoic Era
Show Answer