A population ecologist uses many terms while writing his case study. Match each term to its definition.
birth rate
death rate
population density
growth rate
an indication of the number of individuals of a population and the area that they occupy
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an increase in the number of individuals of a species over a period of time, expressed as a percentage
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the number of live births per 1,000 organisms of a species in a year
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the number of deaths per 1,000 organisms of a species in a year
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Compare and contrast the adaptations of free-living flatworms and parasitic flatworms

The kidney filters potentially toxic substances in the blood, and thus “clears” the blood of those substances. this clearance function is dependent upon and proportional to the diffusion gradient of the substance across filtering capillaries, i.e. if the concentration of the substance is doubled, twice as much will be cleared from each ml of blood that is filtered. suppose that the body produces a constant amount of a substance x per unit of time. the kidneys eliminate substance x at a rate directly proportional to the concentration of the substance and the volume of blood cleared each minute (c): elimination = c × [x], where [x] is the steady-state concentration of substance x. imagine an individual with an initial concentration of x equal to [x]0 who develops kidney disease. her baseline clearance c0 drops to one half of the original (½c0). what is the new steady state concentration of x? (for simplicity, assume that substance x is 100% filtered by the kidney).

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are