Question

1. what are the basic units of length, mass, volume, and temperature in the si system?

Explanation:

The International System of Units (SI) has defined base - units for various physical quantities. The meter is for length, the kilogram for mass, the cubic meter (derived from base units but commonly liters for practical volume measurements) for volume, and the kelvin for temperature.

Answer:

Length: meter (m); Mass: kilogram (kg); Volume: cubic meter ($m^{3}$), often liter (L) in practice; Temperature: kelvin (K)