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:
Nitrogen is a constituent element and is part of many compounds in plants.
Explanation:
Nitrogen is a building block and there is no process in plants that is not affected by nitrogen.
If there is not enough nitrogen in the soil, the growth decreases, the leaves are yellow, pale green, chlorosis occurs, the root is removed, its branching is reduced, the yield and quality of fruits are reduced.
4 is B. It wasn't in the genes to get short wings.
5 is C. It should be natural selection but adaptation is another way to say ns.
A gamete contains one set of chromosomes
bring change in the genetic basis of a population
