The Hellenistic Erasistratus discovered the heart was the pump to push blood through the arteries.
Aristarchus developed the theory that the sun was the center of the universe.
Euclid wrote the basic geometry book, Elements, that was used for 2000 years.
Hero of Alexandria devised the first steam engine although he considered it merely a toy.
Answer:
i think it might be that he donated money and asked the wealthy to donate money
B. an economy that has all three other economic systems present
Your anwser would be a. Saftey
