Elements are pure substances made up of a) atoms b) molecules c) compounds d) neutrons

oak trees? ? what was listed

airlines i think? or a cruise boat? does this work out for u? ?

if you listed your answers right then i believe your answer is b.

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.