[cristianpascu]

Water is one of zillions of elements that need to get together for there to be life. Expectations increasing? Yes. Greatly? :)

[tim333]

It's a big one though. You also need a planet with a suitable temperature. Beyond that most of the other stuff seems pretty much everywhere.

[unclebunkers]

It's about 24. There are about 24 different elements found in the least element diverse life forms on earth if I recall.