During the concrete operational period mental capacity expands to allow for reversibility and , which means to simultaneously focus on more than one aspect of a problem.

Reversibility

Explanation:

In simple words, Because it represents the commencement of reasoned or practical reasoning, Piaget believed the tangible stage to be a crucial turning point in a preschooler 's cognitive growth.  The kid has reached the age where logical reasoning or procedures (i.e. principles) may be applied, but only to tangible things (thus concrete operational).

answer; /// more likely to fight in the future;

answer; form new memories;