U12 1.20
Babies with very low or very high birth weight are less likely to survive. The graph shows the percentage of babies born at
different weights.
SEE
% Babies Born at Different Weights
-% Babies Born in that
Category
4156-06
5.0-5.5 lb
3.5 lb
4.0-4.511
8.0 8.51
6.0-6.5 in
7.0-7.5 ih
100-10.51
>111b
Which statement is a valid claim that could be made using the data in the graph?
O Directional selection is occurring because the aranh favors an extreme
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Which of the following occurs after a natural or unnatural disturbance in an ecosystem

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior

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).