All animals which possess a spine are included in the same . 1. species
2. genus
3. phylum
4. class

Phylum

Explanation:

All vertebrate animals belong to a phylum which are also called  what i remember, Chordata.

Also, animals with a spine are also called vertebrate animals, so jellyfish and other spineless animals are not included as a vertebrate.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.