What is the most common way humans store carbohydrate energy

            Carbohydrate is the first source of energy to human body. Glucose is the simple unit of carbohydrate which is used in respiration and produce ATP. When we eat food that contain carbohydrate, it convert into sugar units that are absorbed in small intestine. From here these sugar units travel to liver through blood where excess sugar is stored in the form of glycogen. When the body need energy this glycogen is converted to sugar through glucagon hormone and is used in respiration to produce ATP, which is necessary for  the activities of humans.

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature

Ibelieve the answer is a-broad because that is a leafed plant.