How do scientist develop scientific explanations about subjects that are impossible to study through controlled experiments?

A scientist could use a model to represent what you are trying to experiment, thus making it possible to come up with an explanation for an answer.

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you