Dr. macpherson believes that the way students organize and think about the information in their textbooks will strongly influence their ability to later remember and use what they have studied. dr. macpherson's ideas most directly exemplify the perspective. behaviorist

In the given question, the blank can be filled with cognitive.  

The study of mental procedures like language use, attention, perception, memory, creativity, problem-solving, and thinking is known as cognitive psychology. In psychology, the cognitive approach is a comparatively modern approach towards human behavior, which aims at how one thinks. It presumes that one's though procedures influence the manner in which one behaves.  

The cognitive perspective is related to mental procedures and understanding like perception, memory, problem-solving, and thinking, and how these are associated with behavior.  

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.