Which were characteristics of Alexander the great empire select the two correct answers Alexandria Egypt became a center for learning or trade in Africa. Europe and Asia declined or grease, became isolated from other ideas or the size of grease. His empire got smaller, or Greece was unified under one ruler.

The correct answers are:

1. Alexandria Egypt became a center for learning or trade in Africa.
2. His empire got smaller, or Greece was unified under one ruler.

Alexander the Great established the city of Alexandria in Egypt, which became a significant center for learning and trade in Africa. Alexander's empire extended from Europe to Asia, but after his death, it was divided among his generals, resulting in the empire getting smaller. Additionally, Alexander's conquests brought about a measure of unity among the Greek city-states, as they were unified under one ruler.