Historical Development

Periodic Table Of Elements|Historic Development Of Periodic Table|Dobereiner's Law Of Triads|Newland's Law Of Octave|Lother Meyer Periodic Table|Mendeleev's Periodic Table|Modern Periodic Table|OMR|Summary

fill in the blank with suitable article given in the bracket. This is ...... important historical event. (a/an/the)

Question based on Introduction to Photosynthesis in higher Plants| Historical account part 1 |Historical account part 2 |Photosynthetic pigments