Which one is first Hen or Egg?
To answer this question we need to understand that evolution occurs at sperm and egg stage. So that we may say that different species reproduction, in this process some rare events caused genetic variation may laid Egg
The company that needs a new machine tool, but hasn't bought it, is already paying for it.
Similarly, The man who is in need of a thinking tool but hasn't acquired it, is already paying for it.
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