What are the findings of studies that have tried to teach young children (under age 6) to conserve?

Question

Quizplus · Accepted Answer

Studies have shown that with special training, young children (as young as 4 years old) can learn conservation principles and apply them across materials. This suggests that children under age 6 are able to use the principles necessary to solve conservation problems, contrary to choice A. However, it is also true that children may have difficulty transferring the concept of conservation to other materials beyond clay, as stated in choice B. Lastly, while it is not accurate to say that children under age 6 are "just as ready" to solve conservation problems as older children, as their cognitive development is still ongoing, it is possible for them to learn and apply conservation principles with targeted training.

What Are the Findings of Studies That Have Tried to Teach