Plss ! the models below represent nuclear reactions. the atoms on the left of the equal sign are present before the reaction, and the atoms on the right of the equal sign are produced after the reaction. model 1: atom 1 + atom 2 = atom 3 + energy model 2: atom 4 = atom 5 + atom 6 + energy which of these statements is most likely correct about the two models?

a. both models show reactions which produce energy in the sun.

b. both models show reactions which use up energy in the sun.

c. model 1 shows reactions in the nuclear power plants and model 2 shows reactions in the sun.

d. model 1 shows reactions in the sun and model 2 shows reactions in a nuclear power plant.

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).