I believe all the above aka 4 because the communities had to much of an over crowding which lead to crime and then a disease broke out which occurs in the 19th century
- Dr. Dunn studies the way that children of different ages organize information in their memory. His research focus is primarily on <u>cognitive</u> development.
Such as the construction of roads and aqueducts, and of sewers that could wash the filth of the city into the Tiber.
One of the influences of the Arabs when they came to Africa was trade.
When the Arabs came to Africa, they traded heavily with the Swahili people and shared the Islamic religion with them.
<h3>Africa and the spread of Islam</h3>
Around the eighth and ninth centuries, there was am influx of Arabs especially in eastern Africa.
Arab traders and travelers, began to spread the religion along the eastern coast of Africa especially to the swahili community in Eastern Africa.
Other people to which Africans traded with around the same period were Persians, the Indians, the Chinese etc and this trade was referred to as the Indian Ocean trade.
Learn more about the Indian Ocean trade at brainly.com/question/24686699