Why are viruses not considered to be organisms and not described as being alive? 1) virions are unable to reproduce by themselves. 2) virions are not able to metabolize by themselves. 3) virions are not able to synthesize dna by themselves. 4) virions are not able to assemble spontaneously?

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).

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

it's d - life cycles - apex