Todo app for my iPad to use and the iPad version of answer is A
The Seattle longitudinal study of cognitive development discovered that among older people (d.) higher socioeconomic status is associated with higher levels of intellectual functioning. Interacting socially and economically is a great factor in keeping up your intelligence up to date.
Answer:
Correct answer is The two nations competed for control over Nubia.
Explanation:
First option is not correct as both countries were independent. Egypt had a lot of dynasties that ruled in the country.
Second option is correct as Kush created an independent country on the soil of Nubia and fought for control with Egypt. They even ruled in Egypt for some period.
Third option is not correct as they were trading a lot for example.
This is not correct as their cultures were quite different and were very often engaged in quarrels.