If you own an lgbt flag does it mean you are one or you support it? this is from curiosity.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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.