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- Scales protect fish from predators and parasites and reduce friction with the water. Multiple, overlapping scales provide a flexible covering that allows fish to move easily while swimming. Like us, fish also need to take in oxygen and expel carbon dioxide in order to survive. But instead of lungs, they use gills. Then the blood moves through the fish's body to deliver the oxygen, just like in humans.
- Electrons cannot flow through the circuit. Loads do not function in open circuits because the current does not pass through them. For example, a light bulb will not light up in an open circuit. This electric cord is made of three insulated copper wires.
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