Ecologist Aldo Leopold wrote about his home state of Wisconsin in The Sand County Almanac. In one moving section, he described a triangular cemetery founded in the nineteenth century that, because of its unusual shape, contained a tiny patch of prairie that was unmowed and undisturbed. Every year, sometime in July, Leopold would watch a single silphium plant bloom there, the only one he found in that part of the state. He used this example to discuss the many plants native to the prairie that have been replaced by a few commercial plants grown by farmers. Leopold is observing a change in:______.
A) pollution.
B) suburbanization.
C) social ecology.
D) biodiversity.

The question above presents a situation in which many activities are happening in the beta frequency, since they can reflect a mental activity that responds to visual stimuli, which are captured by the open eyes. However, alpha waves are disproportionately present. This, in addition to causing a little cancellation of the beta wave, causes the capture of the waves to be impaired and only the one that this dominant is captured with more precision.