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.
Answer:
Two
Explanation:
A male and female cromosome
Chemical then light energy plz mark me brinliest
Bacteria have been the very first organisms to live on earth in the waters of the first oceans. At first, there were only anaerobic heterotrophic bacteria.
Activation energy - is the minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction.
