What causes a branch in a cladogram

Explanation:

A new branch in a cladogram is given when a new trait arises that sets apart those organisms from the rest of the clade. A clade is a group of organisms that share a common ancestor. Although the organisms within a clade and their shared ancestor will have similar characteristics each branch will have a unique character or trait.

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-lavira: )

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.