Answer AND Explanation:
A group of organs may work together to perform a specific function. such organs constitute an organ system.
Lymphocyte is a form of white blood cell with a single nucleus that is found in the lymphatic system.
A nutrient is a substance that provides essential nourishment for the maintenance of life and growth
Homeostasis is the tendency to obtaining stable equilibrium between interdependent elements from the outside environment
Immunity is the ability of the body to protect against infections and toxins.
calorie is a unit of energy used in nutrition.