SHOULD I MAKE A Po0l FOR SCiENCE????????????

Question

Well In My Class im asked to do one of the following...

design a item that can hold a pop can and keep it either very cold or very hot...i have to design and make this myself and it has to fit in a lunch bag!

design a pool that can be heated to 25 degrees celsius by the sun [we can use a lamp or make a solarpanel] (this sounds hard to me)

Or design a place that can keep plants living so basiclly i have to make a green house that works and have it holding differnet plants instead of it [sounds to big eh?]

well...if you guys can tell me which one to do and maybe even give me a way to do it that would be soooo fr ea ki n awesome...
thanks loads

ohh and its in dating cuz everyone comes to this section and ill probaly get more answers then if i were to post it in homework help

THANKS!

Sorry spelling error in the "greenhouse" paragraph i spelled instead meaning to write inside ohhh and speaking of that it has to hold to pretty big plants meaning the size of the school desk [length and width not hieght!]

Answer 1

you can make a miniture green house, just strep a piece of plastic over a flower bed, an poke a few holes in it, easy as that.

Answer 2

the first one sounds easiest.