4. Animal cells do not have cell walls, but plant cells do. What osmotic environment is the best to them?
(A) animal cells: isosmotic; plant cells: hyperosmotic
(B) animal cells: hyperosmotic; plant cells: hyperosmotic
(C) animal cells: hyperosmotic; plant cells: isosmotic
(D) animal cells: isosmotic; plant cells: hypoosmotic
(E) animal cells: hypoosmotic; plant cells: hypoosmotic