Unit 1 Lesson 4

Question 1

Fossil

Answer 1

Is a trace or imprint of a living thing that is preserved by geological processes

Question 2

Fossil Record

Answer 2

All of the fossils that have been discovered worldwide

Question 3

Extinction

Answer 3

Happens when every individual of a species dies

Question 4

Geological time scale

Answer 4

Is the standard method used to divide Earth’s long 4.6-billion-year natural history into parts

Question 5

What are the 4 major divisions in the geologic time scale?

Answer 5

Precambrian time
Paleozoic Era
Mesozoic Era
Cenozoic Era

Question 6

Precambrian time

Answer 6

Prokaryotes were the dominant life form
They lived in the ocean
There was no oxygen

Cyanobacteria caused oxygen to build up in the atmosphere

Question 7

Paleozoic Era

Answer 7

All major plant groups except flowering plants appeared

Question 8

Mesozoic Era

Answer 8

Age of reptiles - dinosaurs evolved

Flowering plants appeared

An asteroid caused 2/3 of species to become extinct

Question 9

Cenozoic Era

Answer 9

Where we currently live
Humans appeared