Answer:
C. Cell walls
Explanation:
- Animals contain tissues.
- Animals are also able to move from on place to another.
- Animals are heterotrophs since they depend on other organisms for food.
But, as the animals contain animal cells, so they don't have cell walls. This is because only plant cells contain cell walls as they are dead cells, so for protection against temperature, humidity etc, plant cells have cell walls.
Animal cells don't have cell wall. Therefore, option C is correct.
