The Thornapple River empties into the Grand River, which then enters Lake Michigan. All water sources (streams, rivers, groundwater, etc.) for a body of water contribute to the health of that resource. Keeping the Thornapple River healthy is important to the health of the Great Lakes, and is thus especially important to those who get their drinking water from Lake Michigan.
This brings us to an important ecological fact that escapes most people's awareness: Just as the Thornapple river is part of a greater ecological system, we are part of an ecological system. The health of any part of that system affects the whole, and the health of the entire system affects each person.
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