Cherry Cola said:
http://scp-wiki.wikidot.com/scp-165 ... It's been done.
Also felixdan1, do your own damn homework. You're at the computer ergo you have google and wikipedia at your fingertips, gateways into the largest compendia of human knowledge ever assembled. Your town almost certainly still has a library where you can go find books on biology if for some reason you don't HAVE school textbooks any more (said books will almost certainly have some mention of morphological adaptions for deserts, icebound areas, etc as this is fairly common curricular fodder), as well as more specialist ones dealing with desert life. They might even have a crusty old open-access PC and some CDROM copies of Encarta and other traditional encyclopaedias.
Hell, torrent relevant episodes of David Attenborough's "Life" or similar. Go ask your teacher for catch-up notes on the lessons you missed
DUE TO ILLNESS (have a note from parent or even doctor if you can), if they refuse that then they're not doing their job properly and should complain to their head of department. Ask any friends you may have (hopefully??) in said class if you can read up on what they have and swap ideas with them - but don't plagiarise outright. There's only so many different things you can include on it anyway (mainly focussed around protection from sun, water retention, mobility/burrowing if it's a sandy desert which not all of them are, etc) so a fair bit of overlap is allowed if it looks like you've put your own work in.
Heaven's sake, does your school not have it's own VLE / intranet / etc that you can get help through, even download materials relevant to the lessons in question from? 3 lessons isn't much (and 3 days is plenty of time to brew up a suitable answer). I blew through much, much more than that at university - 10 years ago - and most of these were valid catch-up options even then.
But don't come asking strangers on a forum to do an everyday school assignment for you, that's lame and lazy (what if every sick kid did it for all assignments? chaos). All the above things will help you more.
Though of course you COULD go ask one of the chan sites' /b/ boards for suggestions... so long as you include EACH AND EVERY ONE of the things they suggest.
Edit: Oh, and tumbleweed that's actually a big mass of worms that near instantly consume any living, succulent plant or animal matter they happen to bump into as they roll along. How's that? Wierd worms that are halfway to arthropods because of their chitinous casings.
(Now that's got to be worthy of consideration of a minor SCP in itself...?)
Also: Grab-oids. It's been a long time since Tremors was out. You may be able to get away with it without your teacher realising what it is.