The human population has changed since it first appeared on earth as The b. population has generally increased, and at rates that have varied over time.
Humans, as well as other populations, have changed since their appearance on earth. Some populations became extinct as they were not able to cope with the environmental changes whereas other became more adaptable and increased in number over time.
The human population has also increased with the passage of time. However, the increase in the rate of the human population was not a stable one. At some times in the past, the population number declined due to environmental factors such as the eruption of a disease etc.
However, with the passage of time, humans have managed to adapt themselves to the changing environmental conditions and their population is increasing rapidly.
Although a part of your question is missing, you might be referring to this question:
The human population has changed in ways that are similar to other populations. How has the human population changed since it first appeared on earth?
a. The population has generally increased at a relatively constant rate
b. the population has generally increased, and at rates that have varied over time
c. The population increases rapidly until it reaches carrying capacity, where it has remained for thousands of years
d. The population increases rapidly until it reaches carrying capacity, and then decreased at a constant rate
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