What is the answer help please come this picture ( science)

Which material produces static charge when rubbed?

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction