Unfortunately I'm not really an expert on Australian wildlife (well not yet anyway. Maybe when I finish my degree though, hehe.) I can actually think of quite a few other adaptations the kangaroo has for Australia's climate, but they'd all be related to the 'physical changes' bit, not the other two.
I also have a kind of epic amount of uni work right at the moment, which is really annoying
So I'm sorry I can't really help out much more right now, I kind of don't have the time. But yeah, just try looking at desert species, especially mammals etc. And maybe plants, even though they're pretty boring.
Sorry I can't really help much more! If I think of something I'll post it though. Just tell your teacher that he/she made it too hard
