True or false in the game of economics all exchanges must be volintary

Sam and ben have discovered some strange animals living in the woods behind their house. ben is excited because he believes they are marsupials, an animal he's never observed in the wild before. his brother is sure it is not. what feature should the boys consider in deciding whether the animals are marsupials?

How did the kansas-nebraska act contradict the missouri compromise?

To take a standard test such as the psat or plan students must have an