Most of the cell’s energy is produced in rod-shaped organelles called (powerhouse of the cell). question 3 options: mitochondria nuclei vacuoles cell walls

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.