Victor holds doors for attractive female classmates because they usually smile when he does so. victor's behavior is maintained by reinforcement.

Positive reinforcement

Explanation:

In this example, Victor's behaviour is maintained due to the positive reinforcement of the smiles. Positive reinforcement refers to instances when someone's behaviour is rewarded. This reward motivates the person to maintain the behaviour by signalling that this is good and desirable. In this example, Victor receives smiles, and this indicates to him that the behaviour should be maintained.

those sounds of the natural world are bioacoustics, and they're more than a false-color spectrogram of data from the musiamunat conservation area.