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1. Passive immunity by mother's milk, or active immunity by fighting off the disease.
2. d. ii, because the anti-B antibodies will not target type O blood.
3. answer d, or as you say, 4. antigen-antibody reactions. It's when the antibody results in clotting of those cells that the cells can be identified as having that specific antigen.
35. 1. they are nonspecific, acting against any foreign substances. Nope, antibodies act against only the particular antigen they were created for.
Good luck!
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