L6.7 Cenozoic Era and Its Mammals

Which era is described as one of the most formative and terrifying time periods, characterized by giant creatures like woolly mammoths and megalodons?

• Mesozoic Era

• Paleozoic Era

• Cenozoic Era

• Precambrian Era

What major event paved the way for the rise and diversification of primitive mammals during the early Cenozoic period?

• A global warming event

• The extinction of dinosaurs

• The emergence of new landmasses

• A significant increase in ocean levels

What were the approximate dimensions of the Megalodon, a dominant ocean predator during the Cenozoic Era?

• Teeth 5 cm, body 10 meters

• Teeth 10 cm, body 15 meters

• Teeth 18 cm, body 20 meters

• Teeth 25 cm, body 25 meters

What is a leading theory explaining why many Cenozoic mammals grew to be so massive?

• Increased oxygen levels in the atmosphere

• The absence of large reptilian predators

• Abundant food sources due to new plant growth

• Their ability to thrive in open habitats after dinosaurs disappeared

What two key features helped early primates become dominant during the Cenozoic Era?

• Strong claws and sharp teeth

• Large body size and thick fur

• Grasping fingers and forward-facing eyes

• Excellent hearing and a strong sense of smell

What is considered a primary factor in the extinction of Neanderthals?

• Their inability to adapt to life outside Africa.

• The superior technological advancement of modern humans.

• A sudden, catastrophic climate change.

• Competition with large mammals for resources.

What developments are associated with the continued growth of Homo sapiens' brains?

• Increased physical strength and endurance.

• More advanced language, technology, and culture.

• Adaptation to colder climates.

• The ability to coexist peacefully with other hominid species.

Which of the following correctly lists the three time periods that divide the Cenozoic Era?

• Paleozoic, Mesozoic, Cenozoic

• Paleogene, Neogene, Quaternary

• Triassic, Jurassic, Cretaceous

• Eocene, Oligocene, Miocene

What significant geological event began to form during the Paleogene Period?

• The Great Rift Valley

• The Andes Mountains

• The Himalayan mountain range

• The Rocky Mountains

What was a notable climate characteristic of the Neogene Period?

• A generally warm and comfortable climate.

• Increasingly common ice ages.

• Periods of extreme volcanic activity.

• A stable, unchanging global temperature.