What is responsible for telling cells how to behave

Its DNA.

Explanation:

The genetic material of which all living beings are created recieves the name of DNA (deoxyribonucleic acid). It is present in living organism cells and it is the one that provides the instructions of what to do to the cell, it gives orders as of when a  cell needs to grow, to do an specific function and how that cell would respond to its environment.

/the trachea, commonly known as the windpipe

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: