Turning points between periods in ancient Egyptian history frequently relate to which three themes? A. Environmental conditions ( for example, drought)
B. Egyptian expansion into foreign lands
C. Rise and fall of powerful leaders
D. Defeat by foreign culture
E. Trade with foreign cultures
F. Changes in language or culture

Correct The turning points period in ancient Egyptian history include the following themes:

A. Environmental conditions ( for example, drought)

E. Trade with foreign cultures

C. Rise and fall of powerful leaders

Explanation:

Throughout history, there has been various period whereby Egypt civilization was changing as a result of changing conditions. Some involvement in international trade with other countries helped in influencing  thier civilization as well as other factors.

a)scientists

explanation:

the national defense education act had two main goals. the first one was to provide personal that was oriented to defense, including scholars, engineering students and so on. the other goal was to provide financial assistance for the students who would be enrolling at colleges and universities in the 1960s.