Hans Spemann's organizer experiments in vertebrates demonstrated equivalent regulative capacity in organisms Roux's framework classified as paradigmatic mosaic systems, collapsing the simple/complex organism distinction the defense relies upon.

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Hans Spemann(as a historical scientist whose work is being discussed): A German embryologist (early 1900s) who did experiments on developing embryos to figure out how organisms grow and organize their body parts.
Mosaic systems(as a category of organism type in Roux's framework): In Roux's theory, organisms where each part of the embryo has a fixed, predetermined job—like tiles in a mosaic where each piece has its assigned place.
Organizer experiments(as the type of biological experiment Spemann performed): Scientific experiments where researchers remove or move small parts of a developing embryo to see what controls how the body takes shape.
Regulative capacity(as the biological property being demonstrated): An organism's ability to fix itself or reorganize when parts are damaged or rearranged—like how some animals can regenerate lost limbs.

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