Viruses and bacteria are both microscopic and can both cause disease. viruses differ from bacteria in that all viruses

Viruses and bacteria are both microscopic and can both cause disease. Viruses differ from bacteria in that all viruses are obligate parasites, which means they cannot live or survive independently, on their own, but have to live inside cells.

Viruses do not have organelles essential to life such as animal and plant cell have. A virus has no nucleus, no mitochondria, no Golgi apparatus, no endoplasmic reticulum and no ribosomes, therefore it cannot perform propagate itself.

Viruses invade cells and hijack the  cell machinery to manufacture their own virus  components. Once assembled  together, these parts form new viruses which in cases causes the cell to die.

its the cell wall and the they are unique to plant

they are known to reach a speed of 21 miles per hour