what is the basic diffrence between freeze and remove attributes?

Answer 1

remove (default)
The animation effect is removed (no longer applied) when the active duration of the animation is over. After the active end of the animation, the animation no longer affects the target (unless the animation is restarted).
freeze
The animation effect is "frozen" when the active duration of the animation is over for the remainder of the document duration (or until the animation is restarted).