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Meanwhile back at the farm, Tommy and Fredrick were wondering where all of the fish and animals went. Without the fish, they do not have anything to eat. They soon realized that all of the fish were gone because of them.
The fertilizer that gets dumped into me and other lakes and oceans gets changed into nitrogen, which also gets changed into nitrates, nitrites, and ammonia.
The amount of phytoplankton, or tiny living things, gets bigger because of the nitrogen that runs off into oceans and rivers. Because there is a lot of phytoplankton, it gives off a lot more oxygen. It also grows the number of zooplankton, which creates waste. From this waste, the phytoplankton that gives off oxygen die and fall to the bottom of the oceans. Bacteria, or small things that we can't see without a magnifier, eats the dead phytoplankton and causes the oxygen to disappear. An ocean, lake, or river that has no oxygen is called a Dead Zone.
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