The correct answer is option A- HIV virus.
HIV virus is an example of enveloped virus, that has the ability to infect a host cell by attaching itself to it and fusing with the host cell. Once infected, the virus leaves the host cell and moves to another cells to infect them. The HIV virus contains glycoprotein spikes to attach to the host cell.
The papaya, especially the green one, is used as a tenderizer in boiling red meat. This is because of the property of papaya's skin and leaves contain enzymes called papain. When this papain get contact to red meat the connecting tissue of the meat easily breaks down.
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I think that for 1 it’s either A or B as the kidneys and everything get air and the lungs release it.
For 2 is probably D as the others don’t really make much sense.
