The antibodies to the HIV virus may take up to three months to appear in the blood of the infected person.
Therefore, the second blood test is necessary three months after a person thinks that he/she has been exposed to HIV to check the presence of these antibodies and confirm whether the person is infected or not.
The answer you are looking for is chloroplast
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The wolves helped the ecosystem. I know this because of this sentence: The entire ecosystem became degraded until wolves became protected when they were determined to be an endangered species.
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