What are fundamental quantities and drived quantities?

Assertion: Quantities that can be expressed in terms of fundamental quantities are derived quantities. Reason: Examples are Mass, Length, Time etc.

Length is a fundamental quantity

Define derived quantity.

How many fundamental quantities are there is SI units?

What is fundamental quantity? Give examples.

Taking velocity, time and force as the fundamental quantities, find the dimensions of mass.

There are _______ fundamental physical quantities in SI units.

Is head a coserved quantity?