<span>Muslims conquered other areas in Africa and cut off Axum from its lucrative</span>
<span>it made trade difficult for merchants whose business crossed state lines.</span>
Sub-Saharan Africa was experiencing an urgent medical crisis in the early 21st century with the spread of AIDS.
So the correct answer is A.
Hope this helps,
Davinia.
Answer:
Explanation:
Chinampas. Aztec agriculture in the heart of the empire used chinampas for their crops. Chinampa is a method of farming that used small, rectangular areas to grow crops on the shallow lake beds in the Mexican valley. Chinampas were essentially artificial islands created for the crops.
