b. Filippo Brunelleschi was chosen to build the dome for the Santa Maria del Fiore in Florence. He set bricks in a herringbone pattern. He also invented a hoist to raise materials up to the sky.
Filippo Brunelleschi was a goldsmith who promised to build two domes, one nested inside the other without elaborate and expensive scaffolding. He was granted the cupola project in 1420 serving as its superintendent. The project was finished in 1436.
I am pretty sure its D: opportunity cost
Earlier people used to roam farming but later learned to cultivate by staying in one place.
Water is arguably the most essential natural resources needed for farming. But not all society are located near a river. So, people in early farming society move their location from one place to another following the availability of water.
Later on, they started to develop irrigation technique to transfer water from other area to theirs. This mean that they can abandon the roam farming and stay in one place to take care of their farm.
