Biomagnification is a concentration of toxins:
1. Within certain cells of the body as predators consume and store toxins, stored in the bodies of their prey
2. Within the liver as an organism gets older
3. Within the bodies of organisms at low trophic levels
4. None of these is true regarding biomagnification

The correct answer is option 1. "Within certain cells of the body as predators consume and store toxins, stored in the bodies of their prey".

Explanation:

Biomagnification, also known as bioamplification, is a biological process at which toxins are concentrated as the result of predators consuming and storing toxins, stored in the bodies of their prey. In order to study the degree at which biomagnification occurs, some scientists use a biomagnification factor that is the ratio of the concentration of the toxin in the predators respect to the prey.