Virus is considered as both living and non living. justify?

Simple my friend. Its not living because it requires a host cell to reproduce. It also requires a host cell to remain "active" It is also not alive because it does not require energy to survive. It is not really considered "alive" to most scientists, but some would argue that it is because it contains it's own dna.

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).