Question

why do plant cells have a cell wall and animals cells do not ?

Answer 1

Plants cannot move and have to withstand every kind of tough condition.. Whereas animals can move to protect themselves. So plant cells have cell wall whereas animal cells do not.

Answer 2

All cells have cell membranes, and the membranes are flexible. So animal cells can have various shapes, but plant cells only have the shapes of their cell walls. That's nice for plants, because it gives them the ability to grow up and out, where they can get lots of sunlight for making their food.