Answer:
essential
Explanation:
essential is something you need to know
Answer:
Well other because it was from 1650 to 1730
Explanation:
They allow people to move easily between the countries. Also more share a common currency.
This is true because 6 and 15’s sum is 21.
Answer:
Megacities have an impact on public health, like contamination of water. Overpopulated places can bring diseases and a lack of health protection.
Explanation:
Megacities are the base for gas emissions that could be very dangerous for the environment. Traffic jam is getting worse day by day. Almost half of the habitant of one city spends at least one hour in the car to get to work.