Here is my first question.
We all know that water is H2O and we know that oxygen comes from plant life. however it takes water to support plant life. so hows that work?

Um... the chicken. No, the egg.

Water. Oxegen came from plants that absorbed the carbon dioxibe. Just my 2 cents.

As the early planet cooled from being a molten slag, H and O outgassed at the surface. They combined on the surface and the in the atmosphere to produce water. There may have been some comets, as well.

The water filled the lower elevations. Possible precursors for life may have come from comet ices to seed the oceans. In any event, simple cell shapes may have formed as empty vacuoles, which then went on to house various organelles. Bacteria formed at the ocean depths, away from harsh UV from the Sun.

Later changes in ocean pH led to cyanobacteria, which released O2 into the water and atmosphere.

If that's the case there shouldn't be any question about life out there. Is it possible that water could be condensation from the cooling of the planet. By the way nether the chicken or the egg came first that was way down the line. lol

Merril that's pretty good. you guys are quick by time i typed that there was 2 more posts

Mixing and condensation, that's essentially it. Yes.

But dose it require liquid to make condensation?

Oxygen methinks. How can you have water without oxygen first?

Oxygen. Here's a link you may find interesting - "A universe in the life of an Oxygen Atom".

Yeah, gotta be oxygen. The element would have to exist before the compound could.

Oxygen.

I think perhaps the confusion in the OP comes from the idea that plants actually manufacture oxygen during photosynthesis, whereas of course the oxygen was there all along, bound with two hydrogen atoms in the water. Photosynthesis doesn't create oxygen, it simply liberates it from a water molecule. Oxygen is an element which occurs all over the universe, and although stable in its molecular form 02, has mostly been captured gravitationally by stars and other massive bodies. It does, however, occasionally lurk in interstellar clouds.


Interstellar oxygen, yesterday.

That's what I call an explination.