What facts would you use to prove that vegetables come from plants?

all naturally grown foods come from plants. what would a vegetable come from if not the byproduct of a plant? I am sure we are no where near being able to grow a vegetable in a lab without the germination of a seed and flowering of a plant.

a

explanation:

d) the narrator even suggested that the white whale, moby d, was ubiquitous and present in every ocean at every moment.