The two objects shown are made of the same element. What else is true of both objects?
O A. They have the same shape.
B. They are made of only one kind of atom.
O C. They have the same mass.
O D. They have the same number of atoms.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

yes the answer is total mass in unchanged   : )