Most contaminants in the human body must be present at a certain level before they exert any clear health effects.

Question

Quizplus · Accepted Answer

This statement is generally true. Most contaminants have a threshold level, below which they do not cause any noticeable health effects. However, once the threshold is exceeded, the risk of adverse health effects increases. It is important to note that for some contaminants, such as carcinogens, there may not be a clear threshold level and even low levels of exposure can increase the risk of developing cancer over time.

Most Contaminants in the Human Body Must Be Present at a Certain