Is a protein found in blood that is represented by a  +  or  –  sign, which affects the compatibility of blood with other blood types.

Yes, the protein is found on the surface of the red blood cell which is represented by a positive or negative sign.

It is termed as Rh factor.

Rh factor refers to the class of antigen or protein found on the red blood cell.

If the protein is present, then the person is said to be Rh positive and when the protein is absent the person is said to be Rh negative.

The answer will be Rh factor

Explanation: Rh factor is represented by a+ or - sign, which affects the compatibility of blood with other blood types

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.