Besides cell walls, features often found in plant cells but not in animal cells are:

Besides cell walls, features often found in plant cells but not in animal cells are: ·     Chloroplast- specialized organelles in which  light energy is converted to chemical energy during the photosynthesis(chloroplasts contain chlorophylls a and b-green color of the plant)
·     Vacuole-central organelle filled with fluid for storing food (sometimes it is found in animals but rare)·     in animals but rare)
·     Starch-energy storage of plants (it is glycogen in animals)  

Your answer will be b action plan.

Because the carnivores keep the herbivore population in check