Answer:
B Both are directly related to movement.
The standard measurement system used by the scientists is called: International System Of Units, or SI. The units of measurement of a few physical quantities are considered to be base units. (Also do you need the base units too cuz I can help you with that) :)
Answers:
a) 
b) derived
Explanation:
Density 
is a characteristic property of substances and materials and is defined as the relationship between the mass 
and volume 
of a specific substance or material, as shown below:
This means density is inversely proportional to volume.
In addition, density is a derived unit, because is based on two basic units of the International Sistem of Units: Mass (kilograms) and Volume (cubic meters)
