Prokaryotic cells reproduce by a. binary fission b. meiosis c. cytokinesis d. mitosis

The answer is binary fission.

This happens when during the replication of chromosomes of prokaryotes. Similar to mitosis, it divides itself and reproduces asexually. Many bacteria use this kind of process to produce more of this kind of organism in equal sizes.

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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.