To ensure proper protection for food during storage the bottom shelf should be at least 3 inches - 3 feet above the ground. This is to protect the food from pests and other organisms that may cause disease and health-problems to people who are going to consume such produce. It is a common practice done in the past and have evolved in the process of manufacturing these days.
Hii! I believe the answers are Sympathetic, Digestion, and Adrenaline. (:
The correct answer is:
C. Four food groups
