As for as is known no earthlings have ever been on Mars.
No human has really visited any planet other than Earth; the Moon isn't a planet. However, spacecraft have visited other planets, such as the Spirit and Opportunity rovers, who went to Mars
Humans have not technically visited any planet. We have sent landing craft to Mars and Venus though. Those missions were in exploration of possible future human habitats, but neither planet is suited for human survival.
So far we have found no sign of any life, Let alone People, on Mars.
yes
We have examined the planet Mars by means of robotic probes, and we have not found any Martians living there. It is a desolate planet.
Jupiter mars mercury have been walked on by me coz im the best at every thing
Some people have been to Mars and Venus.
yes
It is a rocky planet or terrestrial planet. Any planet before Mars is terrestrial and any planet after Mars is a gas giant.
No one knows what is on Mars, if you mean any life; but Mars is a very dusty and red colored planet
The gravity on Mars or any other planet pulls you toward the planet's center.
yes