A geologist is mapping Carboniferous rocks, all of about the same age, located in the middle of a continent. The geologist's map reveals that the rocks are sandstone in one area, grading into shale
in an adjacent area, and then grading into limestone. What can she infer about the depositional
environment during the Carboniferous Period in this area?
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The area was probably located in a deep marine environment.

The area was probably located at the mouth of a large river.

The area was once a wind-blown desert.

The area was probably located along a coastline.

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).

Which are reasons cells undergo cell division?

Which strand is synthesized towards the replication fork