Answer:
The principal functions of the gastrointestinal tract are to digest and absorb ingested nutrients, and to excrete waste products of digestion. Most nutrients are ingested in a form that is either too complex for absorption or insoluble, and therefore, indigestible or incapable of being digested.
Answer:
Just based on common sense, its either C or D. I would guess C but not 100% sure sorry.
Explanation: