Based on the food web, correctly predict how changes in the number of a certain species affects the balance of the ecosystem. Choose each correct statement by clicking on the sentence.

If the number of rabbits increased, the number of grasshoppers increases.
If the number of hawks increased, the number of grasshoppers increases.
If the number of rabbits increased, the number of insect-eating birds decreases.
If the number of hawks increased, the amount of grass increases.
If the number of snakes increased, the number of rabbits decreases.
If the number of insect-eating birds decreased, the amount of grass increases.

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).