Mitosis is often considered synonymous with cell division. why is this erroneous?

Because mitosis is a cell multiplication

Explanation:

Mitosis is a cellular process that generates from a single cell, two identical cells in size and ploidia. Mitosis  is a process of cell mutiplication that allows to transform the unicellular zygote into a multicellular organism; also allows the replacement of damaged or old cells for new cells in the different tissues.

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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.