coal
solar energy
Because swag.
Plants must complete their life cycle to fulfill their true purpose. For plant's life cycle to continue a seedling must live long enough to produce new seeds.
coal
citizens must pay tax..
comes back down to earth as rain, snow, sleet, or hail, this cycle must be repeated
Without the water cycle there wouldn't be any water to water the crops and plants.Also we need the water cycle because it recycles our water so the fresh water we have can be drinkable. BUT must be cleaned!
I'm not 100% sure, but my guess would be in order to maintain balance in the ecosystem the nutrients must be cycled throughout. In order for all organisms to survive they need each other, which means there must be some sort of cycle in order for the organisms to interact. The Carbon, Water, and Nitrogen cycle are very good examples of important cycles within ecosystems.
It should be balanced to regulate water. The amount of water should be maintained constant.
Correct Answer is: Living organisms MUST be involved.
water and nutrients.
There is no first in a cycle but, most are comfortable thinking ice melts to water, water evaporates to vapor, vapor condenses and fall to earth as rain to snow.