Answer:
a. achieving stage.
Explanation:
Warner Schaie is a developmental German psychologist who has focused on the cognitive stages of people along their lifespan.
According to him, people go through different stages of cognitive development (since childhood and until they are old) along their life span.
The Achievement stage is the second stage of his theory and it takes place in young adulthood, according to Schaie during this stage the individual's primary cognitive tasks are to achieve personal goals in the long term future (starting a family, being successful in their careers, make contributions to society) by applying the intellectual skills that they learned when they were younger (adolescents).
Under the reign of President Thomas Jefferson, the exploration generally had negative slavery effects on the Americans.
<h3><u>Explanation:</u></h3>
Westward expansion of the US was taken as the key to nation's health by Jefferson. It began early in 1803. He signed a treaty with France in which the US paid a lumpsum amount of money to buy the land near Mississippi river, which infact doubled the size of the country.
Believing that the US needed to expand west to help ensure its survival and prosperity he took this chance to buy the land from Napoleon Bonaparte of France. Though this resulted not in the expansion of the empire rather it became the reason for the destruction of the republic.
I think the answer is fertility and health but i could be wrong.
Http://education.seattlepi.com/were-important-factors-explaining-spanish-victory-over-aztecs-incas-6...
check on here you'll probably find it