Easy access to water and is Arable land
The Iowa caucus, Iowa’s most famous and first caucus, compels that people attend a meeting for about 2 hours wherein they express their preferences and then these people try to convince others who are undecided to join the group of their candidate.
The meetings typically happen in churches, schools, public libraries or even individual’s houses and the caucuses are done every 2 years.
Answer: Fixation
Explanation: Fixation simply means being obsessed or preoccupied with a particular course or action. It occurs when an individual focuses all its energy or attention on a certain course or means such that the individual fails to identify other means other viable ideas which could cost lesser stress, energy, cost and even yield better results.
In the question above Kevin was entirely fixed or tied to using threat to make his children do what he wants such that he couldn't think or see other better ideas which could yield better results.
The answer is Human
While the other options are always affecting the ecosystems, humans have a greater affect than all of the above