The second statement best explains the type of blood vessel and the function of these vessels' valves - <span>These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
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Veins are large blood vessels which carry blood back to the heart. <span>Veins have a system of valves to prevent back-flow.</span>
Answer:
no this is operant conditioning
Explanation:
operant conditioning is a learning style which was first studied by Skinner and it is based on positive or negative reinforcement to induce learning. In this example we can see operant conditioning with negative reinforcement. Herbie learned after a punishment he got to his action
