Which is NOT an effect of friction? O slows objects
O generates heat
O adds mass
O wears surfaces down

The answer is add mass.

Explanation:

Friction does NOT add mass to an object. It does generate heat, slow objects, and wear down surfaces.

see earlier answer

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.