Phosphorus isn't as abundant as nitrogen or carbon because it is contained in the
+ and
released with
processes, which can take a long time.

Phosphorus isn't as abundant as nitrogen or carbon because it is contained in the lithosphere and released with geological processes, which can take a long time.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

i think that d. wind is the answer.   i missed the question when i answered a. currents.