question:
The main function of the human digestive system is to

answer:
break down foods for absorption into the blood

question:
In clear weather, a bright light can be seen for a long distance. In conditions of heavy fog, the visibility is greatly reduced. Which of the following explains the reduced visibility?

answer:
Light is scattered by water droplets in the air.

question:
Which of these resources will most likely be depleted first?

answer:
Fossil fuels

question:
Which equipment will best separate a mixture of iron filings and black pepper?

answer:
magnet