Sixty-five million years ago, the dinosaurs all suddenly disappeared from the earth.
Until recently, scientists did not understand why this happened, but then, in Mexico,
they discovered a huge circle more than 100 miles/160.9 kilometers wide. This circle
was caused by some very large object, probably a meteor, that hit the earth and caused
changes in the earth's climate and sea levels. These changes may have
a. helped the dinosaurs live longer.
b. been necessary for the dinosaurs.
c. killed the dinosaurs in Mexico.
d. been disastrous for the dinosaurs.
Sixty-five million years ago, the dinosaurs all suddenly disappeared from the earth.Until recently, scientists did not understand why this happened, but then, in Mexico,they discovered a huge circle more than 100 miles/160.9 kilometers wide. This circlewas caused by some very large object, probably a meteor, that hit the earth and causedchanges in the earth's climate and sea levels. These changes may havea. helped the dinosaurs live longer.b. been necessary for the dinosaurs.c. killed the dinosaurs in Mexico.d. been disastrous for the dinosaurs.
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