Whales have what seem like remnants of a pelvis and femur, What are these structures an example of?
transitional structures
analogous structures
vestigial structures
adapted structures

i am going to guess that it is co2.

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.