Answer:
Mass and density
Explanation:
Density of an object is defined as its mass per unit volume. Mathematically, the relation is given by :

m = mass and V = volume
If we know the density of the Eraser and its mass, we can easily find its volume. Hence, the two tools are mass and density.
Its because they wanted a way to move faster in the industrey
To starve aposing countrys of needed money for goods
Bioenergy - renewable energy produced by living organisms such as plants.
The primary renewable energy sources in South America are 16% bioenergy, 8% hydropower and 1% each for geothermal, solar and wind power.
Answer:
what-? virus on this app-?