1. Aim: How do scientists explain how organisms have changed from simple to more complex orgainisms?
Evolution 1

2. First organism on Earth
simple unicellular organisms
Anaerobic
heterotrophs
The first organisms on earth were _______________________.
prokaryote cells

3. How do scientists explain this change from simple to more complex organisms?
Theory of Evolution
The process by which
species ________ over
time (simple to complex).
Present day species are
______ to ancient species.
change
related

4. What is a theory?
Theory of
Evolution
Is an explanation, supported by __________ and/or____________ , that can be used to explain related occurrences.
observations
experiments

5. What is the evidence that supports the Theory of Evolution?
______________ collection of fossils that provides _______ to the history of Earth’s organisms. The fossil record spans much of _____________ (billions of years of Earth’s history).
Comparitive ______________
Comparative Embryology(_____________)
4)Comparative Biochemistry (_________________)
Fossil Record-
clues
geologic time
Structure
similar embyos
DNA & Proteins

6. Embryology
Anatomy

7. Amino Acid Sequence
DNA Sequence

8. How do we know that we have evolved from ancestors distinctly different from us?
The fossil record (remains of dead organisms) have given scientists the ______ they needed to determine an organisms ________ by ___________ them to present day species.
clues
ancestry
FOSSILS
comparing

9. The fossil record shows…
simple
Life has evolved from _______ to more _____________
complex
Newer Organisms:
more complex
Older Organisms: more simplistic

10. What do we learn from fossils?
How did ___________ evolve?
How long did individuals _____?
How do ________ evolve over time?
behaviors
live
features

11. Speciation
Evolution has lead to the formation of _____ species from _________ ancient organisms
new
different
Species- a group of organisms that share certain ______________ & can _____ with one another, producing
__________ offspring.
characteristics
mate
fertile

12. Similar to a family tree
Descendents
Descendents
Common
Ancestor

13. Evolutionary Tree Species living at ______ time (top) present
Ancestral _________ species (bottom)
common

14. 100’s of Millions of year ago
Our Common Ancestor
Unicellular
Common
Ancestor
100’s of Millions of year ago

15. How closely related are they?
Which organisms are closely related?
Those who have a _______ common ancestor (a ______ point of intersection in a tree diagram)
Which are distant relatives?
Those who have a _________ common ancestor (a _____ point of intersection in a tree diagram)
recent
distant
close
far

17. Summary of early evolution
Present day