As part of your independent study in field biology, you are sent to a small, inland sea. In one of your samples, you discover a small eel-like creature. It has a stiff, rod-shaped structure running the length of its dorsal side, with a line of nervous tissue running along with it. You would begin the process of classifying this organism by placing it in phylum:

Explanation:

The organism which have a well defined neural chord or notochord running throughtout the length of there dorsal surface atleast once in their life time are classified as chordates.

Since the organism we found is a eel like with a stiff rod shaped structure running the length of its dorsal side, with a line of nervous tissue running tissue which represents a notochord, classification should begin by placing it in Phylum chordata.

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.