Interesting article, but only mentions 'carbon' once: > " Tracer experiments supported the notion that nitrogen, likely in the form of ammonium, is separated f

Interesting article, but only mentions 'carbon' once: > " Tracer experiments supported the notion that nitrogen, likely in the form of ammonium, is separated from the carbon skeleton of glutamate in digestive fluid (Fasbender et al., 2017). In multiple carnivorous plants, ammonium transporters (AMTs) appear to play pivotal roles in ammonium uptake." The fundamental difference is that plants tend to use atmospheric CO2 for their carbon source, while the digestive tracts of animals are optimized for the uptake of sugars, fats and proteins for both energy and carbon feedstock purposes. These systems of carnivorous plants are probably optimized to extract the CHOPKNS_CaFe elements from their prey that they can't get from the atmosphere.