“One of the biggest sources is called nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, ranches, and forest areas. Millions of motor vehicle engines drop small amounts of oil each day onto roads and parking lots.”

Question

make a simple sentence to come after this sentence

Answer 1

This contaminated runoff eventually flows into rivers, lakes, and oceans, harming aquatic ecosystems.