Hiv, the virus that causes aids, is transferred through body fluids. people once thought that hiv infections were untreatable. now, many people live relatively long and healthy lives despite being infected with hiv. this is possible because science a. develop new medicines. b. treat inherited diseases. c. change societal attitudes. d. formulate new laws.

The right answer is A. develop new medicines.

HIV is a very particular microbe: it is a retrovirus. That is to say that its genetic material is in a form of RNA, a molecule close to the famous DNA that contains the heritage of human cells. Thus, to infect lymphocytes, he has to transform his heritage into DNA thanks to a particular enzyme: reverse transcriptase.

This specific molecule of the virus was the target of the first available treatments as early as 1987. Known as reverse transcriptase inhibitors, they made it possible to reduce the multiplication of the virus and maintain the rate of T lymphocytes, thus slowing the progression of the disease. The first of these was zidovudine, better known as AZT.

As the natural history of the virus in the body was unveiled, other means of struggle appeared.

Once introduced into its host cell, the virus will produce many proteins, necessary for the manufacture of new viruses. But to produce these elements, you need an enzyme, the protease, that will somehow give the final touch and make the various elements functional. Protease inhibitors prevent this last step, blocking the production of new viruses. Thus, in 1995, was available the first compound of this new therapeutic class: Saquinavir.

As early as 1996, the treatment of HIV infection was oriented towards the combination of several treatments: tritherapies (for example combination of an antiprotease and two inhibitors of reverse transcriptase). These new approaches have revolutionized the treatment of the disease, making the virus undetectable in the blood and thus preventing the development of AIDS.

Develop new medicines.

Explanation:

AIDS ( acquired immuno deficiency syndrome) is caused by HIV virus. This virus attack on the T helper cells of the body and directly target the immune system of the organism.

The HIV infection cannot be treated but scientists have discovered the medicines and methods that can increased the chances of survival of the infected disease. The drugs can directly target on the replication of the HIV virus.

Thus, the correct answer is option (A).  

chemical weathering

explanation:

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)