How can an organism be both primary and secondary consumer?

A organism can be both a primary/secondary consumer by eating both plants and animals, this makes a animal a omnivore.

Explanation:

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.