The answer to this question is not known.
No
Mercury.
What do mean
Because it is simply.. The only planet to live on.
All of them.
Venus is Earth's twin.
No one knows for sure if life exists outside of the planet Earth. There are some human beings outside of the planet Earth on the International Space Station which is in orbit about 250 miles above the planet.
As far as we know, the only planet that human beings have walked on is the planet Earth; we have also walked on the moon, but that is a satellite, not a planet.
No. They were seeded here in the 1970's by beings from another planet.
Trees are not lungs of human beings. However, trees play a vital role in producing oxygen through the process of photosynthesis which is essential for humans to breathe. They help remove carbon dioxide from the atmosphere and create oxygen as a byproduct, contributing to the overall health of the planet and the air we breathe.
Man has made many choices including choices that damage the planet like the introduction of nuclear power. Man has made choices to create wars and choices to build cities.