What happened to life on mars?

Answer 1

While we still hope to find evidence of life, it's possible that life on Mars just never got started. Areologists (they're like geologists, but they study Mars rather than Earth) believe SOME of the necessary life conditions (liquid water, organic molecules, a certain density of atmosphere) existed in Mars' past but they can't actually say that EVERYTHING was on hand, mainly because nobody's sure exactly what everything is.

If there was life, it probably stayed very primitive (after all, the first couple of billion years on Earth were not very progressive, evolution-wise) and died off as the planet's weak gravity let atmosphere and water vapor escape into space.

A tantalizing possibility remains that at some future time, we can BRING life to Mars (or Mars to life) by an as yet non-existent process called "terraforming."

Answer 2

There is currently no evidence of past or present life on Mars. Scientists continue to study the planet's surface and atmosphere to search for signs of microbial life or habitability. So far, no conclusive evidence has been found.