zzzskizzzThere are billions if not trillions of other plants, obviously other life exists. But if we have to talk to them or not that is a completely different conversation.
There are an estimated 10e24, or 1,000,000,000,000,000,000,000,000, planets in our observable universe, and that's using a relatively low approximation of galaxies (200 billion) too. If we then very roughly assume that each planet orbits and belongs to a star and that each of those solar systems is a replica of our own (excluding Pluto), that would mean there are theoretically 125,000,000,000,000,000,000,000 possible planets teeming with life within what we have so far observed of the universe. It's almost impossible to think that there isn't or can't be life that exists or has existed in the universe aside from our own.
The real obstacle that needs to be considered here though is time. Alien races and species and cultures and entire, inter-galactic civilizations very well could have existed and subsequently become extinct millions, even billions of years ago, yet we would have absolutely no idea of ever knowing that. Pretty mind-blowing to think about, and especially humbling knowing almost certainly that the universe is completely indifferent to our existence.
Hopefully humans one day eventually get in touch with other intelligent lifeforms; it's just a shame we're such a poorly evolved species, which I'd expect would have some sort of bearing on whether an other advanced race would want to interact with us in the first place.