It's the classic "the chicken or the egg" paradox. Which came first, the membrane or the cytoplasm? Did a membrane develop first to allow various chemicals in and out? Or were the chemicals concentrated enough to allow metabolism before the membrane developed? Similarly, how did the genetic system develop? Did the proteins come first or the genetic code?
3. The relationship between diabetes and depression apparently cuts both ways: Not only are people with treated type 2 diabetes at a heightened risk for developing depression, but individuals with depression are also at risk for developing diabetes. It's a classic chick or egg question, because doctors don't know which one comes first – the diabetes or the depression.
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