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You take a pregnancy test on your third or fourth missed "period" day. If you test earlier than you will get the false report.
The Answer is A. Hope I helped! Have a wonderful day.
Answer:
An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
Explanation:
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