WHICH IS A MAJOR DRAWBACK TO THE USE OF HYDROGEN POWER? A. burning hydrogen releases greenhouse gases.

B. hydrogen power creates toxic waste that must be stored forever.

C. the use of fossil fuels is required to create pure hydrogen.

D. hydrogen may run out in the next 100 days.

By his speech’s did he live up too his expectations

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.

Unique question.well, using science, you cannot create or destroy even if you do eat yourself so you would not grow twice as big, nor would you disappear. you would stay the same but change states potentially, or at least change your appearance (obviously).hope this . keep up these unique questions.

Ithink i might know wait one second let me serve