20 which statement is true about the cells in multi cells organisms? ?

They usually have certain special functions (I believe)

your best option is 5,000 kg

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.