Some cells have cell walls (plants do, animals don't) to keep their rigid structure. They also prevent water loss.
Plants and fungi have cell walls. Note that while plants have cell walls made of cellulose, fungi cell walls are made of chitin.
Animalia
The species inside the animal kingdom are example organisms that do not have cell walls. This includes reptiles, birds and mammals.
Bacteria with peptidoglycan cell walls and fungi with chitin cell walls are two examples of single celled organisms with cell walls.
only plants have cell walls, so all plants would be the answer.
Various organisms have cell walls, including plants, fungi, algae and bacteria.
Snake
Yes. They have a cell wall. Plants which are eukaryotes also have cell walls.
No, peptidoglycan cell walls are characteristic of Eubacteria, which are prokaryotes.
Animals.
No some types of bacteria do not have cell walls
Cell membranes are selectively permeable while cell walls are semi-selectively permeable. Keep in mind that only low level organisms, like plants, have cell walls.