What is meant by the term “bioaccumulation”?

The term “bioaccumulation” refers to the accumulation of substances, such as pollutants or toxins, in the tissues of living organisms over time. This process occurs when an organism absorbs these substances at a rate faster than they can be eliminated from its body. As a result, the concentration of the substances can increase to levels that may cause harm to the organism and potentially affect higher levels in the food chain.

Bioaccumulation is especially concerning with persistent organic pollutants (POPs) and heavy metals, which can remain in the environment and accumulate in the biological systems of organisms. Over time, as predators consume prey, these toxins can magnify in concentration through a process known as biomagnification, leading to significant ecological and health risks.

The other options, while related to environmental science, do not accurately describe bioaccumulation. The first option pertains to evolutionary processes, while the third option discusses the decrease of pollutants, which is distinct from the accumulation concept. The fourth option deals with the expulsion of toxins, which is the opposite of accumulation. Thus, understanding bioaccumulation is crucial for assessing environmental and health impacts associated with contaminants.