A water quality manager takes four samples from different locations in a local river that supplies the town's drinking water. The following types of indicators are found in the water samples.

Location 1 - Heavy metals and POPs
Location 2 - Detergents and carcinogens
Location 3 - POPs and detergents
Location 4 - Fertilizers and heavy metals

Which location has the most substances that could bioaccumulate in the local population?

- Location 1
- Location 2
- Location 3
- Location 4

After taking and analyzing the four samples described, the water quality manager can conclude that the organisms in location 4 present the most bioaccumulation of contaminants.

Bioaccumulation is an organism's ability to absorb substances from the water which is then stored in the cells of that organism. Once consumed by a predator, this substance is passed along the food chain, affecting the entire ecosystem.

Of the substances listed, the ones able to be bioaccumulated by organisms are:

Fertilizers
Heavy metals.

This leads us to the conclusion that the area with the most bioaccumulative substances in the water is location 4, and fishing should not take place in this location.

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