Many Naturally Occurring Environmental Exposures Increase Risk for Cancer

question 95

Multiple Choice

Many naturally occurring environmental exposures increase risk for cancer.Residents in many parts of North America are exposed to low levels of the radioactive gas ________ in their homes,particularly in homes with basements.

• A) dioxin
• B) PCB
• C) nitrate
• D) radon

---

Definitions:

Stimulus

Any event or situation that evokes a response.

Automatic Response

A reflexive, involuntary reaction to a stimulus, which occurs without conscious thought, often as a result of learned behaviors or innate reflexes.

Stimulus

Any event or situation that evokes a response from an organism in the environment.

Event

An occurrence or happening, particularly one of significance that can be planned or unplanned.