In each pair, three letters are between them like CG in between C and G three letters are there i.e., D, E and F. So, GK will fill the blank.
All Except `Raft' are down by animal.
Only '729' is a perfect cube.
This is the only prime number in the group.
All others are soild metals.
Former is the food for latter.
As, 4 : 9 similarly 8 : 13
? ? = 13
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