Age determines the amount you should consume from the plate
There are many reasons why Zachary can't concentrate. He might have something on his mind that is bothering him, he could be hungry, he could not have a lot of energy. The best thing Zachary could do to help the paper not suffer is leave his desk and paper alone for about a half an hour, and maybe eat something, or just take a break. Maybe take a nap to get some energy back up so that he can get everything he needs in his paper.
Symptoms of Scurvy and Malnutrition occur.
According to AROUSAL approaches to motivation, each person strives to maintain a certain level of stimulation and activity.
Answer:
The environment if it is a modifiable factor, since you have the ability to change it, or to migrate from that environment, if it is harming your health.