Why are vertebrates larger than invertebrates?

Well, isn't that a happy little question! Vertebrates tend to be larger than invertebrates because their skeletal structure, made of bones, provides more support for their bodies to grow bigger. This allows vertebrates to have more complex internal systems and larger body sizes, which can be quite majestic to observe in nature. Just like how a big tree grows from a strong trunk, vertebrates grow bigger thanks to their sturdy backbone.