C, if you look at a water wheel, water flows on the wheel, turning a rod, powering something on the inside. Dams do the same thing except the rod goes into a transformer and is more complicated.
The steps that the U.S has recently taken to counter cyber crime include; Setting up a system of voluntary cyber-security standards, and also opening a new center dedicated to managing cyber activities. Cyber crimes are crimes that involves a network and a computer, a computer is used as an instrument of further illegal ends. Cyber crimes may threaten a person or a nation's security and financial health.
The green sample possibly contains algae or some other sort of bacteria