Copper atoms are used to produce pennies. the copper atoms in pennies share many electrons. pennies contain [blank] bonds.

Can anybody me with this? ? (picture included.)

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

Select the correct answer. what does the process of natural selection involve?