Answer:
because it comes from the everyday activities of many different people, such as fertilizing a lawn, using a pesticide, or constructing a road or building.
Explanation:
The answer is tunicates. Tunicates are commonly known as sea squirts and are in the Chordata phylum, even though they don't have a back bone. Which is really weird. But they just got put into the same category as humans. This is because they have a notocord and a back bone when they are larvae. But they lose all these when they become adults.
That as you increase in trophic level 1/10th of the nutrients is lost. Starting at the consumers (plants) all the way to humans.
