what will you say if asked about it by a very small child? If you tell the truth, easily, without stammering or fidgeting or sidestepping ... and if you don't feel that you're somehow Destroying Innocence by doing it ... you're probably okay.

Did just that with my own son (who was then four years old). The only problem was finding honest language that was in or near his vocabulary.

What did the botany student eat, if not previously living beings? Dirt?