Answer:
it takes the place of a noun
Explanation:
Cardiovascular or cardio-respiratory endurance or aerobic fitness, is the ability of the heart and lungs to deliver oxygen to the body's tissues during sustained physical activity. Muscular endurance is the ability of a muscle, or group of muscles, to perform continuously without fatigue. Weight training can be performed with free weights, such as barbells and dumbbells, or by using weight machines to increase the muscular strength.
For people suffering from high blood sugar, the insulin
helps decreases the amount of sugar in the system. The negative feedback in the
system regulates the amount of sugar in the system in order to maintain the homeostasis
in the body.
