Why is virus not included in the category of micro-organism?

What is the Importance of black soil? Under some circumstances valuable natural resources can be considered pollutants Explain this statement giving two examples? What phase of matter has the greastest density for most substances? Why do volcanoes at a hot spot eventually become extinct? How many elements does helium have? What are some human and physical characteristics of Houston? How many moles O2 must react with excess H2 to form 7.89 mol H2O? Where is 10 south and 50 west? What is it called when water is removed to bond into one larger one? Ile lat zyje kot syjamski? Will cactus change color if you dye the water? Is plutonium a ionization energy or a electronegativity? What is the weather of the certain area over a long period of time? How can you find the mass of an object if the volume is known but not the density? What are the active hybrid? Is absolute sterilization possible? In the US where do the blue red green and white wires on a fan go to when the ceiling has red black bare copper and white wires? Is sunlight the only source of energy for the preparation of food by plants? Are temperature or color changes always observed at the same time as the formation of gas bubbles? Why are white blood cells used in blood transfusions?