Next, Grabowski sent a fresh batch of non-evolved Avidians on a treasure hunt. This time, cells contained a numerical code, which indicated in what direction the organisms should turn to find more food. But there was an additional twist to the task. Some cells contained the instruction "repeat what you did last time". The Avidians once more evolved into forms that could interpret and execute the instruction. "The environment sets up selective pressures so organisms are forced to come up with some kind of memory use - which is in fact what they do," says Grabowski."
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