The greatest sailor in the ming dynasty was Zheng He cause he improved there ship's and the sailings skills.
Answer:A
the Incan civilization was known for the impressive waterworks in their city centers. Some of these included canals, fountains, drainage systems, and expansive irrigation.
One example of their advancement in this area is the Incan citadel called Machu Picchu which is said to be "the pinnacle of the architectural and engineering works of the Inca civilization" when talking about its water supply system.
<span> Women in most
countries went to work in bomber, tank and other military-based
factories because most of the men had gone off to fight. This is where
"Rosie the Riveter" came from. They'd also take care of and run
businesses that their husbands, fathers, brothers, etc. had left. You
also had women serving in the armed forces as nurses, radio controllers
and secretaries</span>
