"Of course they do. If it weren't for them we'd all starve and, well. Suffocate, to be honest, which isn't really what anyone wants. It's all part of the circle of life." The Doctor frowned for a moment, then his face cleared up as he remembered. Right, The Lion King! Of course, that's what he was thinking of. He'd really have to watch that again when he got back to the TARDIS.

"You could have been born someone else. What would that make you then, unimportant? It'd still be you." He paused for a moment, but in the end he smiled. "I'd still think you important."