Best Answer: In humans there are two. Glycogen, which is a long chain carbohydrate made by polymerising glucose molecules together, is stored in the liver and, in small amounts, in the muscles. It provides a fast boost of energy for short intense exercise.
A freshman is 9th grade - 14 - 15 yrs. old. A junior is in the 11th year of school./ A senior is in the 12th and final year of high school. Ages vary but a junior is 16-17 years old and a senior is 17-18 years old. Junior is 11 grade, senior is 12 grade (for high school) A junior would be around 17 and a senior around 18.
A freshman is the first year in high school, which is 9th grade. A sophomore is the year above a freshman, and is 10th grade, your second year in high school. Also, just for reference, 11th grade is referred to as your junior year, and 12th grade, your last year in high school is considered your senior year.