What is an estuary?
a. where a freshwater river runs into an extension of the ocean
b. where a freshwater river runs into an extension of a lake
c. where a freshwater river runs into land
d. where a freshwater river runs into another river

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.