A plant root i an example of

The plant root is an example of an organ.

Plant consists of many different organs, which include leaves, stem, reproductive organs, and roots. All the organs play a different role in the plant.

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.