Based on the clue 'by volume this element makes up about 78 of our at...', what is the answer?

Based on the clue 'by us law this spread must be at least 80 milkfat ...', what is the answer? Based on the clue 'by using pendentives the byzantines managed to set...', what is the answer? Based on the clue 'by virtue of the great quantity eaten this vegetab...', what is the answer? Based on the clue 'by volume this deep siberian lake is the worlds la...', what is the answer? Based on the clue 'by wars end they had banked over 13 million units ...', what is the answer? What is referred to by 'by way of 3'? Based on the clue 'by way of deception thou shalt do war is the motto...', what is the answer? Based on the clue 'by way of la paz', what is the answer?