<span>The most approprate answer is a. water. Although over 70% of the earth's surface is water, only a small percentage is fresh water that is suitable for domestic purposes. The high rate of pollution and the over use of groundwater resources can use water faster than it can be replenished. Some rivers and lakes can become so polluted that they cannot be used for domestic or even agricultural purposes. </span>
Its a process to conserve ecological services and restore natural resources while meeting socioeconomic, political and cultural needs of current and future generations.
Declining birth rate, all the pollutions, crowding , and house shortage
Answer:
The watershed simply restricts the movement of water toward one side, because the water can not move up but only down or on a flat area.
Explanation:
The watersheds represent physical boundaries that are separating the flow of water to rivers, seas, areas, or to put it simply, they direct the movement of water in different directions. The watersheds are marked by landforms that are at a higher elevation than their surroundings, and the separation of the movement of water occurs at the ridges.
Basically, the water moves downward on each side of the ridge. This means that the water on one side of the ridge belongs to one watershed as its waters go in one direction and area, while the water on the other side of the ridge belongs to another watershed because its waters move in another direction and area.