Answer :
Final answer:
Proteins are the key nutritional class that absorbs vitamins and sustains the immune system.
Explanation:
Proteins are the nutritional class that absorbs vitamins and sustains the immune system. Proteins play a crucial role in the immune system by producing antibodies that help defend against infections and diseases. Examples of protein-rich foods include meat, fish, dairy, legumes, and nuts.
Learn more about Nutrition and Immune System here:
https://brainly.com/question/26402342