In the atmosphere<span>, </span>carbon<span> is attached to oxygen in a gas called </span>carbon<span> dioxide (CO</span>2<span>). With the help of the Sun, </span>through<span> the process of photosynthesis, </span>carbon<span>dioxide is pulled from the air to make plant food from </span>carbon<span>. </span>Through<span> food chains, the </span>carbon<span> that is in plants </span>moves<span> to the animals that eat them.
Learn More At: </span>http://www.windows2universe.org/earth/Water/co2_cycle.html
The example of a nonpoint source of freshwater is the first option: <span>pesticide runoff from farm fields. This is one of the most common nonpoint source of poullution</span>
