4. Certain species of fish are unsafe to consume in high quantities because these fish
O A. have high levels of metals in them from cancer-causing pesticides.
O B. contain vitamins that aren't water-soluble and can cause toxicity.
O C. ingest other fish that are poisonous to humans.
Choice A. Fish can accumulate various heavy metals in them through a process known as bioaccumulation. This applies mostly to large predatory fish like tuna, because they eat large quantities of other fish.
