In the hydrologic cycle, infiltration refers:

A. plants taking up water from the soil.
B. the change of water from a gas to a liquid.
C. water from precipitation becoming part of the groundwater.
D. the change of water from a liquid to a gas.

C. water from precipitation becoming part of the groundwater.

Explanation:

The hydrologic cycle also called water cycle is a natural process which involves continuous movement of water on, above and below the surface of the Earth. Some of the important process involved in the hydrologic cycle are  evaporation, condensation, transpiration, infileration, and runoff.

Infiltration is the process by which water precipites through pore spaces or cracks into the subsurface soils and moves into rocks. Infiltration occurs in the upper layers of the ground but can also proceed through the water table further downward. The infiltration rate depends on factors such as the amount of precipitation, the amount of vegetative cover over the area,  the type of soil, the rates of pre-saturation, the rates of evapotranspiration in the zone and the topography of the soil.

Hence, the correct option is C.

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.

the answer to your question is:

c. complementary base-pairing