Check all that apply.
hypotheses are based on observations.
hypotheses are written when experiments are complete.
hypotheses are formed from testable questions.
hypotheses are tested with controlled experiments.

Hypotheses are based on observations.

Hypotheses are tested with controlled experiments.

Explanation:

Hyotheses are tested with controlled experiments so they can be proved in order to become a theory.

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.