An ecosystem is balanced when the plants, animals, humans and other non living things live in harmony where there is no disturbance in balance. With factors like overpopulation, pollution etc there are more chances of loosing that harmony.
Answer: Muscle cramps may occur during exercise, at rest, or at night, depending upon the exact cause. Dehydration is a common cause of muscle cramps. Numerous medicines can cause muscle cramps. Most muscle cramps can be stopped if the muscle can be stretched.
