Download Name due date ______ period

Name ________________________ due date ________ period ______
WKST: EVOLUTION AND GEOLOGIC TIME
Use the words in the box to fill in the blanks in the statements.
adapted
epochs
geologic time scale
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
continents
eras
natural selection
environment
fossils
evolution
extinct
plate tectonics
periods
species
The division of Earth’s history into units makes up the _____________________.
Major divisions of Earth’s history are _____________________.
Each major division may be divided into _____________________.
The Cenozoic Era is divided into _____________________.
Clues to which organisms lived in different eras are found in _____________________.
A gradual change in life-forms over time is _____________________.
Each change in Earth created different surroundings for organisms, these surroundings are called their
_____________________.
A group of organisms that normally reproduce among themselves is a _____________________.
After major changes in Earth’s environments, species either died out or _____________________.
Species that could not adapt to changes eventually became _____________________.
Organisms with traits that are suited to an environment survive by the process of __________________.
At different times in Earth’s history, plate tectonics caused collision and separation of ______________.
Many species adapted or became extinct because _____________________ caused their environments to
change when the continents collided or separated.
List the events and types of organisms in the box in the order in which they appeared on Earth. The oldest one is
Number 1.
amphibians
complex organisms
cyanobacteria
Pangaea
organisms with hard parts
fish
invertebrates
reptiles
shielding of Earth from ultraviolet rays
oxygen and ozone layer
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
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11. Which of the events in the list occurred in the Precambrian time? ________________________________
12. Why is so little known about the Precambrian time? ___________________________________________
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13. What are some differences between amphibians and reptiles?____________________________________
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14. What might have caused the mass extinctions of many land and sea animals at the end of the Paleozoic
Era?_______________________________________________________________________________
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