A scientist observes a population for several years and compiles the data into a survivorship curve. What does a survivorship curve show?
A. The amount of biodiversity needed to bring the population to
carrying capacity
B. The rate of emigration by members of the population
C. The proportion of individuals in a population expected to live to be
a certain age
D. The population size at which the ecosystem stabilizes

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

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).

Which of these parts of the membrane large moecules pass through it ?