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polet [3.4K]
4 years ago
13

Why is a second blood test necessary three months after a person thinks he or she has been exposed to hiv?

Biology
2 answers:
stepan [7]4 years ago
7 0
It takes 3 months for antibodies
Elza [17]4 years ago
6 0
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.
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Issen Sengeki... Messatsu!

The answer is 2.

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4 years ago
Please help me, I don't understand the answers and I'm bad at biology ;-;
abruzzese [7]
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3 years ago
Where would you expect to find the kelp forest, a type of algae, pictured here and why?
sertanlavr [38]

answer:

Where would you expect to find the kelp forest, a type of algae, pictured here and why? Algae live only in the epipelagic zone because it is the only zone with enough light for photosynthesis. During an El Niño year, there is increased precipitation in the Southern United States, but the north is warmer and dry

3 0
4 years ago
1. Studies conducted in England during the Industrial Revolution have shown that children born to poor families were, on average
yKpoI14uk [10]
1. <span>The most likely explanation for this difference in height is a difference in nutrition because rich families have a better lifestyle than poor families.
2. The disease must be recessive because there is a window diagram of people who inherit the genetic disease.
3. </span>A farmer chooses the cows in his or her herd that produce the most milk and breeds only those cows. The explanation in this is the group of cows that produce the most milk are probably the ones who have the link of family lineage between them. Breeding of healthy cows produces also healthy cows thus healthy cows will be breed to each other.
4. I<span>ncreasing the amount of crop harvested should be the advantage of the farmer. Increase of the amount of crop harvested means increase of the farmer's income.
5. </span><span>D. Blastocyst > zygote > embryo > fetus. Blastocysts are structures that formed early in day 5 of in-vitro fertilization process which will be transformed later into zygote. The zygote will undergo in a division process called mitosis and after the first eight weeks of fertilization, embryo will be formed. Bodily or organ structures will then appear and after this development by twelfth week of fertilization, fetus will be formed and this will be the last stage of development that includes growth.
6. </span><span>The new cell that is formed from fertilization is called zygote. This eukaryotic cell is produced from joining of two gametes together. 
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8. Plants and animals reproduce in different ways but they both </span><span>carry hereditary material from parent. Genes from their origins are carried and the appearance of some trait will be shown by the offspring.
9. There is a 50% that the second offspring will be a girl. It really depends on the genetic material and biological character of the mother and there are factors that needs to be checked </span>upon giving birth.
10. <span> One of the plants has the nutrients and light it needs to grow and flower, while the other does not. The environment is similar between the two plants but the manner or means of taking care of it depends on the people who own it. This also affect the access of the pollinator to the flower if a flower does not have any nutrients to give.
11. </span> Over time, a plant pollinated by a hummingbird has developed very long, tube-like flowers. <span>The longer, tube-shaped flowers probably developed to keep the hummingbird from reaching and drinking the flower’s nectar. Birds are creatures who flies high and the for them to reach the flower's nectar, the plant should also be high.
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16. </span><span>In humans, the developing embryo receives nutrients and oxygen through a tube called the umbilical cord. This tube is connected between a mother and a fetus inside the mother's body. The nutrients received by the mother will also be received by the neonate by means of infusion or absorption through the barrier.</span>
8 0
4 years ago
Michael observed dew in the early morning. The water vapor has transitioned in the form of dew. What is this process called?
vodomira [7]

Answer: Condensation

 Water vapor is water  in a gaseous state. Transformation of water into gaseous state (water vapor) is called evaporation. Transformation of the water vapor into dew which Michael observed in the early morning is called condensation.

Dew<span> is water droplets that appears on  exposed objects like leaves in the morning or evening due to condensation</span>

3 0
3 years ago
Read 2 more answers
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