which of the following organisms has the simplest cellular structure? a. bacterium b. earthworm c. mushroom d. sunflower

Another one is Sponges

Explanation:

A.P.E.X.

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.

i wish i could with all of them i can barley see the first one so here's the answer to the first one b