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Einstein once said:
"Things should be made as simple as possible, but not any simpler."
Like Einstein, I follow this sort of phylosophy. I do believe in alien lifeforms, but I don't believe in UFO's.

If there's an another planet with enough Oxygen and Water then there'll be life on it, let's face it, alien or not, no living creatures can survives without the two most important things above, or is there?

Good point HonshuWolf, just because nothing on earth (we know of) cant live without Oyxgen And water dose that necessarily mean that other creatures cant?

Sheba

Well, that depends on the biochemistry. Ammonia and silicon based organisms can, but, as far as it is known, only carbon based beings exist or are most likely to exist, and those need oxygen and water.

I'm afraid you have oversimplified the matter drastically. Not only is it neccessary for there to be enough oxygen and water, they must be pure enough. Also, there are literally countless other things vital to life as we know it. Like they described it in "A Priveleged Planet," our planet is like a complex machine with millions upon millions of dials on it. These dials are the settings for the distance between the Earth and the sun, the Earth and the moon, planetary gravity, magnetic field... I could literally go on forever. Now this may sound like a stretch, but if one of those dials were twisted even a few degrees, life on Earth as we know it would be over.
Another thing to consider: ecosystems. All the right lifeforms have to appear at the same time, or the imbalance will destroy everything. Like when colonists imported new species, old ones were quickly wiped out almost completely (granted, the imports had help from the colonists, but it still would have happened eventually). Just add or take away one species of predator (or herbivore for that matter), and the tower starts to fall. Even in a dog-eat dog world, it's all for one and one for all.

No!!And people don't prove it,and they never!! Trust me

How do you know? The universe is so huge that there could be at least 32 planets with all the conditions needed for life. Our own solar system has several planets in which life could be found: Europe, one of Jupiter's moons, is one of them. Although it is covered by ice, studies indicated that there is a liquid sea below that ice, and it could be inhabited by living creatures similar to those in our oceans.

It's true there are only carbon-based lifeforms, but some (used to) 'breathe' (it's way more complicated than that, but this isn't a biochemistry lesson) using sulfur.

there's got to be life on other plants we can't be the only things(+animals) in the universe

Remember, however, that the defenition of "animal" would not be very clear in other planets, since there could be creatures half animal half plant (plantimals, aniplants, whatever).

Even if there is life out there, we won't detect it. Our definition of "life" is way too narrow. All life must have DNA on earth but that might not be the case on other worlds. Perhaps their life started in a much different fashion than our own. For example, the Drej from Titan AE were made of pure energy; nothing organic. Perhaps there are lifeforms out there like that (and hopefully they won't blow up our planet).

I believe the universe is full of life. Although life existing on other bodies in the solar system, I'm doudtful of that. But I firmly believe that life exists in other planetery systems.

Yes, unless panspermia is real.

All life on Earth is based on the element Carbon, if this is universal then all life in the universe must need water as a fundemental priniciple to survive, therefore life can only exist on a earth type planet. The only other planetery body which might contain liquid water is the moon Europa, in orbit of Jupiter. It's possible that liquid water exists as an ocean under it's icy surface, which means that it's heated by geological activity below. But the only way to know for certain is to actually send a probe to investigate.

If the early geological history of another planet was different to that of earth then it could give arise to life that is fundementally different to our own. For example life based on the element Silicon would be largely mineral then organic. However it cannot be proved on earth since there isn't the right conditions for such life to arise.

MY thoughts exactly.