Matter is made of elements. Plants can make their own food. Some organisms have only one cell. White light can be broken into colors.
I gave my students this multiple choice question: The invention of the microscope was important to the advancement of science. Many other discoveries were only possible with the help of the microscope. The microscope was used to make which discovery?

Only one answer is correct among these 4 choices:
- Matter is made of elements.
- Plants can make their own food.
- Some organisms have only one cell.
- White light can be broken into colors.

Could you tell me which one is correct?

Some organisms have only one cell.