Question

A group of scientists examined a meteorite from Mars and found a carbon-rich substance that is produced when microorganisms decay. They concluded that the meteorite provided evidence there was once life on Mars. Why is this an emerging idea?

Answer 1

Other scientists disagree about the origin of the carbon-rich substance.

The scientists only studied one meteorite

Answer 2

Because this tells us that we were not alone and that we may not be alone.