Geog1 Unit 1.4 Our Time on Earth

The oldest known fossils of multicellular organisms were found in rocks older than the

• Cambrian period

• Precambrian period

• Hadeon Era

Why do most scientists think the 6th mass extinction is occurring now?

• Human activity is destroying ecosystems

• animal competition is decreasing species diversity

• They don't

On this clock, what time did the dinosaurs appear?

• 11:23

• 10:44

• 11:02

• 10:24

On this clock, what time did the first plants on land appear?

• 11:23

• 10:44

• 11:02

• 10:24

On this clock, what time did the first land animals appear?

• 11:23

• 10:44

• 11:02

• 10:24

What happened at 2:40?

• First dinosaurs

• First single cells

• First plants on land

• First animals on land

What happened at 10:24?

• First dinosaurs

• First Single cells

• First plants on land

• First animals in the ocean

What happened at 10:44?

• First dinosaurs

• First animals on land

• First plants on land

• First animals in the ocean

What happened at 11:02?

• First animals on land

• First dinosaurs

• First plants on land

• First animals in the ocean

What happened at 11:23?

• First animals on land

• First dinosaurs

• First plants on land

• First animals in the ocean