The picture shows a temperate forest biome. The soil in a temperate forest biome is very fertile. Which feature of this biome causes fertile soil?
A
The warm summers dry out the soil, which increases the concentration of nutrients.

B
The leaves fall off the trees each year and decay, which provides nutrients to the soil.

C
The dry climate is ideal for weathering rocks and other materials, and this creates more soil.

D
The animals hibernate each winter, and the soil can make more nutrients wi

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).