How do animals and plants play a role in the water cycle?

Answer:

Plants, especially trees, contribute to the water cycle via transpiration, where water evaporates from the surface of their leaves. Close to 10 percent of all water enters the water cycle due to plant transpiration. Animals contribute to the water cycle via respiration, perspiration and urination.

Explanation:

The also known as the or the , describes the continuous movement of water on, above and below the surface of the Earth. During this process, water changes its state from one phase to another, but the total number of water particles remains the same.



Without the water cycle, freshwater lakes and rivers would not exist and living things would not be able to thrive on land far from the ocean. do not just benefit from the water cycle -- they participate in it. The contributions of living organisms to the water cycle are vital.




Plants, particularly trees, contribute greatly to the water cycle because of the processes they use to . Unlike animals, which get their energy from food, plants convert sunlight into usable energy through photosynthesis. Plants also and through their roots.

When a tree absorbs water, it travels throughout its branches to its leaves. Needed for photosynthesis, trees and plants cannot get the energy they need from the sun without water. During photosynthesis, some excess water from the surface of the leaves, becoming water vapor. The water vapor in the process of travels into the atmosphere and becomes part of the water cycle, in the same way as evaporated water from lakes, rivers and oceans.

At first glance, it may not seem that plant transpiration contributes that much to the global water cycle. But plants and trees supply a large amount of the world's water via this process. About 10 percent of all water enters the cycle via plant transpiration.




Though they don't contribute as much as plants, animals still supply some of the water present in the water cycle. Animals contribute water mainly through , .

When animals breathe, their warm lungs fill with air. Inside the lungs, some of that air condenses into water vapor. When an animal exhales, they release more water vapor than they breathed in, which adds to the water present in the water cycle. Many animals also . When droplets of sweat evaporate from the surface of an animal's skin, they take a bit of the animal's body heat with them. They also turn into water vapor and enter the water cycle, just like water evaporating from plant leaves.

When animals consume water, they to expel the excess, which then then evaporates and re-enters the water cycle. Even animal dung contains some water which may re-enter the cycle in the same way. Though trees represent the biggest living contributors to the water cycle, animals also play a valuable role in recycling Earth's water. Without living creatures, the water cycle’s effectiveness diminishes, and less water recycles. Though often not included in the explanation of the water cycle, all living organisms contribute to it in their distinctive ways.

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