One of the primary ways that a third-party candidate can positively impact a Presidential campaign is through issue advocacy in that they can push the parties to discuss issues that they normally would not.
A negative impact is that they can draw voters away from one of the major two party candidates.
Answer:
d is the answer of this question
Early civilizations such as Mesopotamia and Nubia emerged in regions that had fertile river floodplains. The correct option among all the options given in the question is option "B". The fertile river floodplains made irrigation possible and people of those civilizations did not need to hunter gather. This made them to settle down and the civilizations started.