Based on the clue 'about 70 feet high each one of these obelisks is i...', what is the answer?

Based on the clue 'about 65 of iron in humans is in the form of this ...', what is the answer? Based on the clue 'about 65 of the philippines total land area is div...', what is the answer? Based on the clue 'about 65 percent of you about 85 percent of an ap...', what is the answer? Based on the clue 'about 7 pounds of peach pits were needed to make o...', what is the answer? Based on the clue 'about 70 of chinas rice crop is grown in this rive...', what is the answer? Based on the clue 'about 70 of the iron we absorb ends up in this pro...', what is the answer? Based on the clue 'about 70 of this pungent gas produced is converted...', what is the answer? What is associated with: about 7000 years ago mexican indians improved this crop notably the size of its ears?