"while listening to operatic solos, musicians process the lyrics and the melodies in separate brain areas. this most clearly illustrates the functioning of different neural "

The musicians process the melodies and the lyrics while listening to the operatic solos in the different areas of the brain. The neural network of the brain is quite complex, and the different activities follow different neural pathways. In the listening of the operatic solos, the lyrics and the melodies of the song are processed in the different part of the brain, and hence, different neural networks function during this processing.

Hence, the blank can be filled with 'neural networks'.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

the correct answer is:

a population changes in response to a change in the environment.