Question

what physical principle is responsible for these features?
newtons third law
the \ice skater\ principle
conservation of angular momentum
conservation of mass

Explanation:

The "ice - skater" principle is an example of the conservation of angular momentum. When an ice - skater pulls in their arms, their moment of inertia decreases and their angular velocity increases while the angular momentum remains constant. Newton's third law is about action - reaction pairs. Conservation of mass is about the amount of matter remaining constant in a closed system. The features in question are most related to rotational motion changes which are governed by conservation of angular momentum.

Answer:

conservation of angular momentum