Answer: Formal operational stage of cognitive development
Explanation:
Formal operational stage of cognitive development is the level of Piaget's theory of cognitive development where a person is able to generate hypothesis about world and things for answering issues.For solving certain problem, best predictions are made regarding to it in a systematic and orderly manner.
This type of thinking is considered scientific rather than hit and trial method because meaningful ,relatable and valid guesses are made in accordance with the question or problem.Then best way for solving problem is then concluded.
D. Elect officials to serve in the government
The people choose who they want to hold power by voting
Answer:A. route of exposure
Explanation:Route of exposure refers to how someone got exposed to that allergen that got them sick. There are different routes of exposure , the way in which a substance enter one's body , it can be through inhalation, ingestion , skin absorption and injection. For example inhalation occurs mostly when a substance is a chemical in the form of vapours , gases , particulates and mist .
For this reason by knowing how it entered the body the pediatrician can determine what the substance might have been.
Invasion by the Barbarian Tribes, Economic troubles and overreliance on Slave labor.