Writing with sentence variety

People in neighborhoods with a lot of trees and grass have fewer chronic health problems. 

When governments improve roads in poor sections of cities, property values go up.

Although the number of people worldwide has increased dramatically, some countries have a falling population. 

Exercise can strengthen bones, but the effect is actually quite small. 

Because indigenous peoples had no immunity to European diseases, many died. 

Melting polar ice raises sea levels, so many coastal areas are flooding. 

The study reported what the researcher had found. 

The biologists were worried about the population of the eastern lowland gorilla, which lives in the war-torn region. 

The United States government consists of three branches: the executive branch ( e.g., the President and Cabinet), the legislative branch (Congress), and the judicial branch (e.g. the Supreme Court).

After the fall of the Soviet Union, many boundaries in Europe changed dramatically. 

_________________ most of Greenland is covered by an ice sheet, its population is confined to the coastline. 

Buffalo are native to Africa and Asia, _________________ bison are found in North America. 

Marta, who goes by a single name like many male players, _________________ is one of the best female soccer players in the world. 

Scientists argue that race is a social construct _________________ racial categories should be discontinued. 

_________________ we reduce pollution in our oceans, coral reefs will continue to die.