Why are common cold viruses difficult to cure? A copy of the DNA is made from the viral RNA.

The virus leads to other viral infections such as the flu and HIV.

Vaccines prevent the development of a cure.

The viral genome mutates very quickly.

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explanation:

i think the answer is g1

hope i

-lavira: )

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

the question isn't complete here so i can't right an answer '_'