Final answer:
The development of operations decentration and reversibility in the concrete operational stage of cognitive development contribute to the acquisition of conservation.
Step-by-step explanation:
The development of 'operations decentration' and 'reversibility' contribute to the acquisition of conservation in the concrete operational stage of cognitive development. Operations decentration refers to the ability to consider multiple perspectives and understand that an object or quantity can remain the same, even if its appearance changes. Reversibility is the understanding that objects or actions can be reversed to their original state. These cognitive abilities help children understand the concept of conservation, which is the understanding that certain properties of an object or quantity remain the same despite changes in appearance or arrangement.