Yeah LH,

I'm pretty sure. If you are talking about life made of atoms and that uses energy. I am 100% sure. That's the kind of life I'm talking about because that's pretty much our current definition of life.

If you are postulating some sort of subatomic or trans-dimensional "alien life" that is undetectable by humans, that fine. But since that kind of life obvious cannot effect me because it is not manifest in my plane of existence, then I choose not to speculate on whether it exists or not.