Which of these factors make hydrogen fuel cells a better option than burning fossil fuels? Hydrogen fuel cells have a higher energy efficiency.
Hydrogen fuel cells create less pollution.
Burning fossil fuels relies on outdated devices and technology.
Hydrogen is the most abundant element in the universe.
Hydrogen fuel cells are more expensive than fossil fuels.

Hydrogen fuel cells have a higher energy efficiency.

Hydrogen fuel cells create less pollution.

Hydrogen fuel cells have a higher energy efficiency.

Hydrogen fuel cells create less pollution

i got it right on the assignment

b brown mice / white sand dunes

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.