What happens when a mixture is formed?
two or more elements are fused together through a chemical reaction.
two elements are combined such that they can no longer be identified by
their individual properties
two elements are mingled together without combining chemically.
two identical atoms are joined together chemically,

Which lists the organs in the correct order as food passes from the mouth to anus?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

What do we mean by the event horizon of a black hole?