If a black cat mates with a gray cat what are the chances of the offsprings being white

Why is it essential to operationally define the variables in a study?

Asafe and responsible driver must have a. a positive attitude towards driving b. a friend in the car to navigate c. a gps system d. the ability to drive aggressively

Two technicians are discussing oil changes. technician a says that waste oil and old filters need to be disposed of according to the law. technician b says that old filters can be returned to the parts department for a core value. which technician is correct?           a. technician a only   b. both technicians a and b   c. technician b only   d. neither technician a nor b