Answer the following question given this paragraph: 

Very small numbers can also be expressed using scientific notation. The mass of an electron in decimal notation is 0.000000000000000000000000000911 grams. In scientific notation, the mass is expressed as 9.11 × 10 -28 g. Notice that the value of the exponent is chosen so that the coefficient is between 1 and 10.


Q: What system can be used by scientists to express very small numbers?

 Choices:

- similar notation

- scientific diffusion

- certain diffusion

- scientific notation

A:
scientific notation
