When we label things, we group them based on similar characteristics. Like Trees. Trees are a basic category. All trees share similar characteristics--like they grow, they're tall, they have leaves... Wait a second. If we look at specific examples, we can find discrepancies from the label.
Dead trees have stopped growing. But they're still standing there. So are they still Trees? Bonsai Trees are itty bitty Pine Trees don't have leaves, they have needles. Even Deciduous