If cells were only relying on biochemical reactions to do something, then whenever a certain condition would appear, the cells would react the exact same way every time. But that's not what happens! The cells get used to nuisance stimuli, like we get used to police sirens, and react weaker or less frequently. To put it simply, the cells learn to ignore stuff just like we do. Which should be impossible if they only reacted chemically - the same thing would cause the same reaction. This experiment proves that thinking happens on molecular level! https://scitechdaily.com/single-cells-can-learn-a-revolutionary-discovery-in-biology/
