What kind of scaling constraints can you think of that apply to 3D animals, but not to flat (almost 2D) organisms? Consider the relationship between surface area and volume as animals get bigger and how it might relate to their ability to survive.
One would suppose body mass/ weight that a 3-d entity has would be constrained by the ability of the skeleton to grow and support it. Also by the ability of the organs to perform functions on a level that encourages or discourages proportionate growth. Perhaps the availability and richness of food sources would also be a limiting factor in the development of size constraints.
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