Which organisms have cell membranes and which do not

Generally all living organisms do have cell membranes, except viruses (this is still a controversial topic). I hope this helps :)

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.