Which graph best represents directional selection? Graph A has trait value on the horizontal axis and population of individuals on the vertical axis. The original population increases, decreases, increases, and then decreases again. The population after selection increases at the point that the original population drops. Graph A Graph B has trait value on the horizontal axis and population of individuals on the vertical axis. The original population and population after selection have similar curves, but the original population peaks before the population after selection. Graph B Graph C has trait value on the horizontal axis and population of individuals on the vertical axis. The original population peaks at the same time as the population after selection but the original population peaks higher and at a more rapid speed. Graph C

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).

Dna and rna share a number of similarities,but they also differ in certain aspects of their structure. wich nitrogenous base is found in rna but is not found in dna

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin