One way that chemicals enter organisms.

Lead, Cadmium, and Mercury are examples.

One well-known persistent organic pollutant.

One particle of a given substance mixed with 999 999 other particles.

The process in which chemicals become more concentrated at each trophic level.

The major source of cadmium poisoning in humans.

They have long lives.

The time it takes for the amount of a substance to decrease by half.

Bioaccumulation of these chemicals can cause birth defects in offspring or failure to reproduce.

One major source of mercury.

POPs enter ecosystems in the form of

A chemical that is used to eliminate pests.

The accumulation of this is the most harmful

Introduced a large amount of lead in ecosystems.

They do not degrade and cannot be destroyed.

Synthetic chemicals containing chlorine that are used in the manufacture of industrial products and persist in the environment.

They are species that greatly affect population numbers and health of ecosystems.

Metallic elements with a high density that are toxic to organisms at low concentration.

The process in which micro organisms break down chemical pollutants to lessen environmental damage.

Harmful compounds containing carbon that linger for many years in water and soil.