The organism that was most likely to live at the same time as brachiopods were
Trilobites
Your answer will be B plants makes their own food. They also have a cell wall and animals don't.
A common way that humans pollute water is through the addition of nutrients (fertilizers and sewage) to water as nonpoint source pollution. These added materials are full of nitrogen and phosphorus, two nutrients that encourage the growth of aquatic producers, such as algae.
I think the answer you're looking for in theory but I could be not understanding the question well enough.
