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.
Answer:
The student is falling asleep in class
The student lashes out at other students
The student has frequent headaches
The student talks about feeling like a failure
Explanation:
All of these are signs that a teacher might look for in a student who is experiencing stress..