Answer:
The natural barrier
Explanation:
If this is not a choice i did it so i could ace my math test to get sdome free answers. Just copying the guy above me.
Answer: Concrete Operational Stage
Explanation:
Conservation is the concept of things staying the same even though other elements change, and this becomes apparent when a child is anywhere from 7-11 years old which puts them in the concrete operational stage.
Immediate rewards is the answer
1. Matter as in a physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
2. Matter as in an affair or situation under consideration; a topic