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I would say the yellow box.

Explanation:

The arrows show how the forces are unequal and are pushing in opposite directions. They also show that student B is pushing harder. But it does not show the actual amount of forces being applied to the pushing.

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.

the answer to your question is tooth decay.