How did chemical constituents essential to life arise on primitive Earth?

Experiments show that simple molecules can combine chemically rather than biologically to form the building blocks of DNA, the key component of all life forms. These processes might have taken place on primitive earth, but how they occur is an unsolved puzzle.

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<p><a href="http://www.physorg.com/news112977065.html">How did chemical constituents essential to life arise on primitive Earth?</a></p> <p>Experiments show that simple molecules can combine chemically rather than biologically to form the building blocks of DNA, the key component of all life forms. These processes might have taken place on primitive earth, but how they occur is an unsolved puzzle.</p>