Here's link to the answer:
tinyurl.com/wpazsebu
1.Tyrannosaurus Rex Lived in the Mesozoic Era
2.The largest mass extinction happened in the Paleozoic Era
3.Life exploded for the first time in the Precambrian Era
4.The Chicxulub crater in the Cenozoic Era
The monomer of carbohydrates, monosaccharides.