What are SI units? Why are they used in science?

E.g. 1N (Newton) is the force needed to give 1kg (kilogram) of mass an acceleration of 1ms2 Try that with the 'English' units. SI is used in most places around the world, so our use of it allows scientists from disparate regions to use a single standard in communicating scientific data without vocabulary confusion.

Explanation:

The SI system, also called the metric system, is used around the world. There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

correct answer is a. and d.