Coal and oil are examples of _____. They were formed from plant and animal remains.
_____ reflect the number of deaths per 1,000 people in one year.
A female who is neither too old nor too young to have children have reached _____.
During _____, a large number of people move from one place to another.
The total number of people on Earth is the _____.
A person's _____ is the total number of years that person is expected to live.
_____ lets parents decide when to have children and how many children they want to have.
_____ referes to a way of living that is usual for a person in a country.
Improvements in _____ have increased birth rates and decreased death rates.
Exponential growth can be shown on a graph with a(n) _____.
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