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What powers Earth's external heat engine?
Fertility Rate
The average number of children born to a woman over her lifetime within a population.
Population
A group of individuals of the same species living in the same area and capable of interbreeding.
Survivorship
The probability that a given individual in a population or cohort will survive to a particular age; usually presented as a survivorship curve.
Species
A group of organisms sharing common characteristics and genetic heritage, capable of interbreeding and producing fertile offspring under natural conditions.
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