Re: Where are the trees.
Earth has been completely transformed by a few microorganisms. Then a few macro ones did so again, more so. Then one particular type did even more so!
The moon, is clear as day "dead" to life. Mars? The same, by a fraction of a degree the other way also. Colder, less light, no radiation protection.
Explorer for the learning, but don't pretend you might find something you know for certain is not there. A bit like promising the kids there is ice cream on a road trip, when you know you left it at home.