Which sample of matter can be seperated into different substances by physical means

A mixture of matter. A mixture consists of two or more elements physically combined. Take salt water. It is a mixture. So just evaporate the salt water to dryness, it would be separated into salt and water. Hence, mixture can be separatedinto different substances by physical means. You can also use magnet.

I believe the answer would be the participant. These roles sound like something everyone in a group should do
Hope this helps!