Which of these is one of the main reasons why viruses are not classified as living organisms?
A) viruses can evolve
B) viruses are single-celled
C) viruses contain DNA or RNA
D) viruses are not made of cells

D

Explanation:

A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Although they have genes, they do not have a cellular structure, which is often seen as the basic unit of life. Viruses do not have their own metabolism, and require a host cell to make new products. They therefore cannot naturally reproduce outside a host cell.

g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

eukarya because is is like alche and b is bacteria and d is animals

explanation: