Overpopulation puts severe stress on the environment because . a) more people live in cities b) disease spreads faster c) populations are widely distributed d) competition for resources is greater

D) competition for resources is greater
The more in the population, the more resources needed. If they run out of resources, the population decreases. They are competing to stay alive.              I hope this helps!

Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !