<span> one who treats afflictions of the nervous system is a(n)
d. neurologist.
</span>
Answer:
a substance that provides nourishment essential for growth and the maintenance of life. Examples include proteins, fats, carbohydrates, vitamins, and minerals.
Explanation:
These are the dictionary definitions so i would recomend paraphrasing. Hope this helps
The Answer to the question
A. Nitrogen
A digestion system specialist is a gastroenterologist