Answer:
(3) Many species have existed in the past, and most have become extinct
Step-by-step explanation:
Cretaceous is a geological period that lasted from about 145 to 66 million years ago.
It is the third and final period of the Mesozoic Era, as well as the longest.
At around 79 million years, it is the longest geological period of the entire Phanerozoic.
Occurred: 145.5 million years ago - 66 million years ago
Era: Mesozoic
Phanerozoic Eon is divided into three eras, the Paleozoic, Mesozoic and Cenozoic eras. These were named for the kinds of fossils that were present. The Cenozoic is the youngest era and the name means “new life”.
wikipedia
Sam Noble Museum