Groups of conditions that often start before a child enters grade school and include limitations on learning and difficulty with behavior control and social skills are known as

Neurodevelopmental disorders

Explanation:

Based on the information provided within the question it can be said that this group of conditions is known as Neurodevelopmental disorders. Like mentioned in the question these are impairments of the growth and development of the brain and/or central nervous system which stunt the development and growth of the individual and cause limitations on learning.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.