Okay, so he'd been a bit specific - but it had been the coral that had given him the answer, so it was understandable, right? And admittedly, given that no-one else was in the same ball park, he was feeling pretty good right now. Herbology was definitely his thing.

...so, what was an ecosystem? Spike knew well enough, of course, since he'd suggested it in the first place. He grabbed his notebook from his bag, flicked past a detailed specimen sketch of Rosie, and raised his hand. "It's the combination and interaction of the living organisms, so...plants, animals and microbes, with non-living entities such as the soil and climate," he answered.