Most viruses can use host machinery to produce more of themselves are persistent and innocuous within host cells switch between pathogenic and non-pathogenic modes of existence kill the cell they infect are rarely found in the natural world.

Most viruses can use host machinery to produce more of themselves

Explanation:

Since viruses carry out no metabolism themselves, they rely solely on the living cells of the host (organism they infect) to replicate and spread from cell to cell.

Thus, viruses do not kill the cells they infect since they need them, and use them to replicate more offsprings

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

the growth of the plants is affected by the heat of the light. what is the student doing?