Afrog may at first be startled by tree branches swaying in the wind, but it soon stops responding to these kinds of unimportant changes in its environment. the lack of response is an example of:

Habituation.

Explanation:

Habituation may be defined as a type of non associative learning. This type of learning reduces the innate response of an individual towards the repeated or prolonged time of the stimulation.

The frog first respond to the tree branches swaying in the wind. After some time the frog does not respond because of the prolonged or repeated stimulus of the environment. Hence, frog shows the lack of response due to habituation.