Drive theories of motivation are often described as theories because internal drives move an organism toward a goal.?

Drive theories of motivation are often described as PUSH Theories. In push motivation theory, a person is motivated to make an effort to move in order to be away of unwanted situation. In this theory it shows that a motivation is being brought up in order to avoid unwanted results. 

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

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.