Which of the following is not true about performing biological investigations?

a. scientists are trained to conduct their investigations safely.
b. reading and understanding the steps before conducting an experiment is necessary for safety.
c. most scientists do not use the metric system or si.
d. the metric system and the revised si are based on multiples of 10.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

that's what i got you can count the number of atoms