A prokaryotic operon is composed of a series of adjacent genes under the control of

Explanation:

The operon is a part of the DNA that is functioning in nature and has a number of genes that are present in the cluster form and is controlled by a single and same operator and promoter. It is made up of a set of genes that are named as promoter, regulator, structural genes and some other. It plays an important role in the process of gene expression on the basis of the environment and some other conditions.

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.