How is the process that has produced resistance to chemical treatments in some organisms similar to selective breeding?

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.