"Oh, well the most obvious differences between plants and animals, is that animals can move around while plants tend to be rooted to one spot," Lea said. "Also animals need to eat other things for food, whether it's meat, plants, or something else, while plants can make their own food with just water and light. Plants also tend to be green and have leaves, but not all of them look like that."

"As to whether plants have hearts... I don't think so. I mean given the number of possible worlds out there, there's probably one or two that have plant people who are an exception to the rule, but generally? Nah, probably not."