Whale researchers use population models that factor a species' reproductive rate and its natural mortality to come up with an estimate of how many are likely dying.

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The country's success in reducing child mortality and population growth can be models for other countries.

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Climate models simulate the statistical properties of the whole population of all possible climate realizations for a certain set of boundary conditions (which can change with time).

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He said the future challenge was to develop care models best suited to the county's rural population.

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But as their population of sicker residents in need of more assistance grows, operators must find ways to adjust their models of care.

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