Any kind of physical discomfort or need (such as hunger, thirst, pain) can make it difficult for a person to focus on any anything else.
you need to concentrate and need to have thinking skills...
Sugar makes food taste sweet and is by itself a "fuel" for our body. A concentrate means to reduce a large quantity of something into a smaller, stronger quantity. In this case, sugar concentrate will be a smaller amount, but will taste much sweeter and you need to add less of it to give the same taste. Sugar is reduced into sugar concentrate, so it's function is that of a base material.
Sleep, play, and you need to be concentrate.
To be able to concentrate properly.
20%
never aiming it at anyone
i do not think so.
If it is open refidgeration is recommended.
According to a google search you really need to concentrate on your science, and math courses.
No, they may be useful to some but if you really do concentrate in class and do your best, you shouldn't need one.
i think you need to concentrate on english more than science.
30 ounces. Roughly a quart. Quart=32 ounces