Nicolaus Copernicus
In the 16th century, Nicolaus Copernicus began devising his version of the heliocentric model. Like others before him, Copernicus built on the work of Greek astronomer Atistarchus, as well as paying homage to the Maragha school and several notable philosophers from the Islamic world
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B
Explanation:
Developed in the 20th century as people began to live longer and have fewer children
People needed to move to new areas because of the floods