Geologic Time Scale 3

At the end of Precambrian time, multi-celled organisms started to grow

• True
• False

What is an amphibian?

• an animal that has no backbone
• an animal that feeds its young milk
• an animal that lives part of its life on land and part of its life in water
• a ball of ice and dust

What is a mass extinction?

• when there was no water
• when many species evolve
• when the Earth was formed
• when many types of species die out

The Mesozoic Era was known as...

• the age of reptiles
• the age of mammals
• the age of plants
• the age of birds

What period are WE living in right now?

• Jurassic Period
• Mesozoic Era
• Cambrian Period
• Quaternary Period

During which era/eon did the dinosaurs live and die?

• Paleozoic
• Pre-Cambrian
• Mesozoic
• Cenozoic

During which era/eon did life on land first evolve?

• Paleozoic
• Pre-Cambrian
• Mesozoic
• Cenozoic

During which era/eon do humans live in?

• Cenozoic
• Pre-Cambrian
• Paleozoic
• Mesozoic

Which type of dating gives us the age of an item in exact years?

• Radioactive or Absolute
• Relative

How old is the earth?

• 4000 years
• 4.0 million years
• 4.6 billion years 
• 4.6 million years