This geologic "era" is sometimes called the age of mammals
Cenozoic Era: Facts About Climate, Animals & Plants - Live Science  Jun 8, 2016 ... The Cenozoic Era is also known as the Age of Mammals because the extinction of many groups of giant mammals, allowing smaller species to...
J! Archive - Show #3728, aired 2000-11-15  To study in minute detail or take apart; some people draw the line at doing it to frogs ... Beadle & Tatum's study of mold on this food helped launch molecular ... The genotype is an organism's genetic makeup; this rhyming word means its...