What is it called when a molecule moves across a semipermeable membrane into a region of higher concentration? a. passive transport b. osmosis c. active transport d. diffusion

C. Active transport

Explanation:

When a molecule moves across a semipermeable membrane into a region of higher concentration it is known as active transport. When there no semipermeable membrane then the movement of molecules from higher concentration to lower concentration is known as diffusion. But when there is a semipermeable membrane in between that time its solvent which moves from higher concentration to the lower concentration not solute and the phenomenon is known as osmosis. This is passive transport and occurs naturally so no energy input is required to be provided for this movement to occur. But, active transport is reverse of passive transport. In active transport, the movement of solvent occurs from lower concentration to higher concentration across a semipermeable membrane. Active transport is not a spontaneous process so in order for active transport to occur we are required to provide an energy input from an outside source.

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step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.