. Chemical digestion . ends in the small intestine ends in the esophagus begins in the esophagus begins in the stomach

I believe that chemical digestion begins in the mouth and ends in the small intestine.  

Hope his helps.

Explanation:

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.