Because they aren't made out of cells, they don't grow, they don't make their own energy, and they can't keep themselves in a stable state. Hope that helps! :)
Answer: Viruses are not alive because they lack some of the key characteristics of living organisms, such as a cytoplasm of organelles. They cannot carry out cellular functions such as metabolism and homeostasis. ... Viruses are included in the study of biology because they are active inside living cells.
