I don't know, probably oxygen or for plants carbon dioxyde
Not a planet of any significant size, which would be easy to see, but it is possible that some pieces of rock are in a similar orbit to the Earth at the five Lagrangian Points of the Earth's orbit.
Most likely not as the term "reptile" on earth refers to a particular group of tetrapods on earth. If similar animals were discovered on another planet they might be referred to as "repiloids"or something to that effect by scientists. Though they might be called reptiles in everyday speech.
In the Solar System scientist found a new planet right now they have nicknamed it to Super Earth. They found water, plants, and another sun. They have a filling that there is life on that planet.
Yes! Life could be found on planet earth!
water used to be found in mars but now it is said that there is a new planet named UB13 that is similar to the earth and contains water
Oxygen-rich atmosphere and liquid water.
It was actualy not too long ago. Scientists discovered it Wednesday morning, December 7th 2011.
If you mean another PLANET - None have been found so far.
Not one scientists can find. All other planets are too far or too close to the sun. i have to change my answer (the one above) there is a planet similar to earth but it has not got life on it. it is similar in its chemical make up not on if it has life on it It's called Gliese. ARE you sure this planet doesn't have life? And if anyone asks, is it possible to get there, you can't............. yet.........
A big ball of gas and helium. Not if your planet is the Earth. Earth has iron at its center.
No. Not yet.
oxygen....