They are when put in good conditions, which means a heater. I put a 7-watt hydor mini-heater in my mom's 1-gallon betta tank, and it was one perky fish! Might want to try that out. And remember, 2x weekly waterchanges as well.
Shame on your teacher though, I feel that's kind of an irresponsible project to give out. It's asking a lot of people to go out and get a pet just for a project. Doesn't really teach people about the joys of actually keeping pets, it's just keeping an animal alive for a grade.
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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