The students conclude that the model shows sedimentary rocks. Which observation leads the students to reach this conclusion? O The model shows the erosion of rock layers.
O The model shows the melting of sediment layers.
O The model shows the chemical deposition of mineral layers.
O The model shows compaction and cementation of rock layers.

Differentiation of cells changes the nucleic information. true false

Which direction does the energy flow in this energy pyramid ?

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).