All of the following developments were available to humans during the paleolithic era except
a.
the controlled use of fire
b.
tools made of stone and bone
c.
spears
d.
pottery

Air masses are characterized by various properties including temperature humidity air temperature pressure and wind speed . which of the following air masses is associated with low relative humidity and high temperature

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

What is an additional type of erosion found at the coast? what does it mean?