What are three common materials that were developed by scientists

antibiotics, penicillin and fertilizersthey.

I don't know if those are in your opcion list, but I think those are the ones.

metals, semiconductors, ceramics and polymers.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.