Question

1. what are the si base units for length and mass? kilometer and kilogram kilometer and gram meter and kilogram meter and gram

Explanation:

The International System of Units (SI) has seven base units. The base unit for length is the meter ($m$), and the base unit for mass is the kilogram ($kg$). A kilometer ($km$) is a derived unit for length ($1\ km = 1000\ m$), and a gram ($g$) is a derived unit for mass ($1\ kg= 1000\ g$).

Answer:

meter and kilogram