Type o negative blood is considered the universal red blood cell donor because it
a.
has all 3 types of antigens.
b.
has all 3 types of antibodies.
c.
lacks all 3 types of antigens.
d.
lacks all 3 types of antibodies.

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

Diverging mirrors and lenses always produce images

Are formed where bumps from two surfaces come into contact ?