Mischka is an amateur astronomer. using her telescope, she looks out past the earth’s atmosphere and observes an object with a long, bright, cloud-like tail behind it. what is mischka observing?
a. an asteroid
b. a meteorite
c. a comet
d. a meteoroid

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Answer carbon dioxide ice;

He got it right defiantly right