Because, Earth is at a right distance from the size of our sun which where water could exist and our atmoshpehere with many gases and not just CO2. Mars could sustain life but need to reduce the level of co2 in its atmosphere to sustain fresh, liquid water.
Earth's scientist have not found life on other planets to date.
Yes, only on the Earth. We don't know if the other planets have life
Astronomers have found Earth-sized planets in other solar systems.
There is life on other planets. Imagine, there are 1000 planets in the Universe for every grain of sand on the earth. That's how many planets there are, so scientifically, the chance that there must be life on other planets as well is much greater than the chance that there is no life.
Other planets do not have water nor life
Fortunately for the other planets, Earth is the only one.
Because Earth is the only place where we can murder the English language and ask questions like, "Why life is possible only in earth not in other planets?"
earth has air , water and life.
No, there is no oxygen on any other planet other than Earth because there is no planet life on the other planets.
We don't know about any other other place, besides Earth, that harbors life. But many scientists think that there is life on other planets.
Other than the Earth, no life has been found on any of the other planets. We are still searching.
Life which does not originate from planet Earth may very well have developed on other planets. There is really no other explanation for where it would have come from.