The soil profile shows * A. one layer of soil at a time.

B. three distinct layers of soil.

C. all of the layers of soil from the hardest down to the softest.

D. all of the layers of soil from the softest down to the hardest.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".