Which of the following describes a reason why companies irradiate some fruits and vegetables before they are sold to the public?
A: to extend the shelf life by killing existing microorganisms

Granite is an igneous rock. Which of these describes what usually happens to granite after it is weathered, broken into small particles, buried deep underground, and compacted?
A: The granite becomes a new rock type.

A scientist was investigating why several fish caught from a local stream displayed similar mutations. He found that the water temperature of the stream was elevated since an industrial plant began discharging heated water into the stream. The scientist concluded that increased water temperature during the egg phase led to the mutation in the fish. According to this conclusion, the mutation was caused by
A: an environmental condition.

The sum of all chemical reactions in the human body is known as
A:
metabolism