How do chemicals made by organisms help establish and maintain a uniform distribution pattern?

they in a current form is too unspeakable

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.

hope it mark me as brainlieast.