Apopulation follows a period of a. decline; overshoot b. increase; scarcity c. scarcity; dieback

The right answer is B.

During the 20th century, the world population increased from 1.65 billion to 6 billion. In 1970, the world's population was half that of today.

In less than 15 years, 47% of the population will live in areas already under heavy water stress. In Africa, between 75 and 250 million people will face growing shortages in 2020 due to climate change. The scarcity of some arid and semi-arid regions will have a decisive impact on migration.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.