Earth is the only planet known to have life on it, however with the vastness of space the likelihood of life not existing anywhere else is astronomically low. We just havent found it yet.
Not all scientists believe this. The topic of Earth being the only planet in the known universe to support life has been and still is a heated debate amongst many scientists.
You need water to live and other planets don't have water
The planet human being's can possibly live on besides-planet earth, Well scientists don't know for sure because scientists are not always correct no offense to scientists though. Well that's my answer!
Earth: the planet we live on, I can't believe you didn't know that!!
Earth is similar to Mars because we know that life is possible on earth and some scientists believe that life is also possible in mars because it has some things which is also present in Earth and is needed for all living things.
i do not know what to think about this i do not know if it is true or false but i am still scared. i believe if it does happen it would be the planet earth as a whole
So far as scientists know, Earth is the only habitable planet in at least our solar system. The universe is far too expansive for them to know in regards to the entire thing.
No, but there are many theories. The big bang, God, and many more.
Because Mars is the closest planet to Earth
Since we haven't actually discovered any aliens yet, we do not know. However scientists do believe that due to there being billions of galaxies out there, there must be another planet like earth with life on it.
People come to know about life existing on planet Earth in the past by studying bones and fossils. These are kept in a databse and are studied by scientists.
Pluto