Steven puts the two stones in a rock tumbler. the tumbler spins so the rocks bump against each other. when the rocks are removed , he discovers that pebble one experienced more change than pebble two . what can steven best conclude about the stones ?

F. Stone 1 is softer and experienced a greater physical reaction.

Physical reaction is when an object's appearance changes, not the identity (which would be chemical reaction). Because stone 1 is softer, it would be easier to change its physical property. Since stone 2 is harder, it's more durable and therefore harder to change. 

It may have some of the same features that it’s mother does but, it may have some of the same features that it’s father has as well.