The logical principle that objects can be grouped according to ...

[melly21297]

The logical principle that objects can be grouped according to some characteristics that they share is
 
  concrete thought.
  transitive inference.
  classification.
  reversibility.

Question 2

The ability to understand the connection between one fact and another, even though it is not stated, is called
 
  transitional thinking.
  abstract reasoning.
  intuition.
  transitive inference.

[nital]

Answer to Question 1

classification.

Answer to Question 2

transitive inference.

[melly21297]

Excellent

[helenmarkerine]

Thanks for the timely response, appreciate it