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B. In the twentieth century alone, the world population grew by more than 5 billion people.
C. Population grew slowly until the eighteenth century because death rates were higher.
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- Hannah ❤
The world growth of human population has been growing since the 18th century due to the availability of medical aid and good living standards.
- Also due to the decline of the death rates population in 1800 was about 1 billion. Hence the option C is correct.
- The population grew slowly until the eighteenth century because death rates were higher.
Learn more about the observations that can be made in relation to the population.
brainly.com/question/20028300.