The Mesozoic Era.
Mammal
Earth is currently in the Cenozoic Era of the Phanerozoic Eon.
Mammals and dinosaurs emerged in the Mesozoic era. Plants appeared in the Paleozoic era, which came before it.
The first living thing discovered in the Precambrian Era was the Cyanobacteria.
pachyderm
a bacteria
The Archean Eon is the period in which the first life on Earth appeared.
Hyrax
The plants, insects, fish and dinosaurs lived on earth during the late Cenozoic era. Now all that is left on the earth are the fossils.
This era, the Cenozoic era, is the age of mammals. But among botanists and paleobotanists, it is known as the age of flowers -- the anthophyta.The extinction of the dinosaurs of the Mesozoic Era allowed mammals to proliferate and diversify.
The Cenozoic Era has the greatest variety and quantity of mammalian life.
A meteor hit the earth in the mesozic era