Well, before I lost you, let me be upfront. Life is not limited to planet earth alone! There are living entities in other planets! Yes there are! In heaven (if you believe in one), are the entities living or dead? To us on earth they are! To them, they are living (maybe they will consider us dead as we do them...maybe...who knows?).
Recently at my hotel room watching Science channel, I came about NASA explorations and in one event, astronauts at the international space station discovered planktons after examining the results from cleaning the station's outer windows. That may have been considered a contamination from earth. And if not? Which is a possibility, where then is the plant from?
I can go on, but here's my perspective, there is life everywhere!
Life on earth is 'housed' differently (plants, animals,..taxonomist will provide the rest). In both animals and plants, there are thousands of species, of which many still remain to be discovered. One certain thing is that you can break this house down to varying composition of water, thermal energy, air, ether, organic and non-organic compounds and elements and of course intelligence, mind and 'spirit' (whatever that means to you).
So, where is life? Life exists everywhere! The composition of the various composites of a body be it of animal or plant as outlined above determines ability to carryout one or all functions of a living organism mentioned earlier. A fish has no fibers, and therefore do well in water. Trees have fibers and are therefore rigid and capable of enduring varying conditions. For the fish and the tree, their composition of water, thermal energy, air, ether, organic and non-organic compounds, varies considerably and one may not survive the other's atmosphere. So goes with planets outside of ours.
In other planets, life is adapted to the varying atmospheres. Sun houses personalities with body made up of predominantly thermal energy and other planets and asteroids have entities with composition adaptable to their atmospheres. Life is not restricted to human like compositions alone. huge WELCOME to JUNO!
To see these lives as we explore space, hopefully our instrument will be suited to detect and interact with them and if it is not we'll keep trying. That wont drain the tax payers wallet. Definitely not! But Are those lives aware of our presence? I'll say yes! Our 3-d world is in itself limiting. That is the first step in understanding existence outside of our sphere. Those limitations may not be correctable, but can be explored. The exploration may not be with the use of limiting instruments. Indeed life is everywhere, one has to use the right instrument to see them.