Question

when substances bioaccumulate in a living organism, in what part of the body are they most likely to build up to dangerous levels? skin brain heart liver

Explanation:

The liver is a key organ for detoxification and metabolizing substances. Bioaccumulative substances, like toxins, are processed by the liver, and due to its role in handling these substances, they often accumulate there to dangerous levels. The skin is a protective barrier, the brain has a blood - brain barrier limiting accumulation, and the heart's primary function is circulation, not major accumulation of bioaccumulative substances.

Answer:

D. liver (assuming the options are labeled A - D as skin, brain, heart, liver respectively)