Explain why ancient civilizations developed networks of highways, waterways, and other -what was the importance of building roads/highways/waterways in ancient civilizations? how did these benefit them?

Benefitted because it made transport and travel much easier

this defines the ability for a flex item to grow if necessary. it accepts a unitless value that serves as a proportion. it dictates what amount of the available space inside the flex container the item should take up.

give brainlest

i believe the answer is d.