Which is most likely the length of a student’s textbook? 30 millimeters 30 centimeters 30 decimeters 30 hectometers

What is the importance of interlocking the fingers and rubbing while washing hands? the palms are the dirtiest parts of the hands. the spaces between the fingers get washed. the backs of the hands get washed. the fingernails are the dirtiest parts of the hands