Which statement best describes why the universe could be considered an isolated system? a. all matter that enters the universe remains contained within the universe. b. energy and matter are created in the universe; when new energy is created, old energy exits. c. in the universe, all energy and matter are contained; no energy or matter enters or exits. d. the universe is a contained system where no energy exits.

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.