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1
Biology/Kurowski
Name:
History of Life on Earth Lecture Outline
I.
II.
III.
IV.
Origin of Earth
a. Earth is…
b. Evidence…
i. About ____________years ago an explosion started the expansion of the
universe.
ii. Known as the __________.
c. Conditions of Early Earth
i. ____________IMPACT EARTH FOR MILLIONS OF YEARS, DEPOSIT LARGE
QUANTITIES OF WATER IN THE FORM OF ICE
ii. EARTH COOLS DOWN …….
iii. _________COLLECTS IN LOW AREAS
iv. _______________ FORMS; AMMONIA, METHANE, WATER VAPOR, CO2, AND
NITROGEN GASSES
v. WHAT GAS IS MISSING? Hint: → __________________
vi. CONDITIONS _____________FOR LIFE YET
Evidence for Past Life
a. Fossilsi. Fossil Typesii. WHERE ARE FOSSILS USUALLY FOUND? In ………….
iii. WHO STUDIES THESE? _______________
iv. HOW DO SCIENTISTS DETERMINE THE AGE OF SOMETHING BILLIONS OF YEARS
OLD? By….
v. RELATIVE DATNGvi. RADIOMETRIC DATINGGeologic Time
a.
b.
c. Eras:
How did life begin?
a. DOES ANYONE KNOW FOR SURE?
1. PRECAMBRIAN
(oldest)
2. PALEOZOIC
3. MESOZOIC
4. CENOZOIC (youngest)
2
V.
VI.
VII.
VIII.
b. ______________ ______________-the idea that life could come from
non-living things (based on the observation that mice appeared from a
pile of rags and wheat)
c. 1668-FRANSISCO REDI PROVED THAT …..
Hypothesis on the formation of the basic chemicals of life:
a. PRIMORDIAL SOUP MODEL–
b. STANLEY MILLER AND HAROLD UREY EXPERIMENTc. BUBBLE MODELFossil Evidence for Oldest Cell
a.
What is known about One-Celled Organisms?
a. FIRST BACTERIA AROUND 3.5 BILLION YEARS AGO
b. SOME ARE CYANOBACTERIA - THESE ARE _____________BACTERIA
c. WHAT DO THESE BACTERIA PRODUCE? ___________
d. WHAT DOES OZONE, O3, DO? _________________________________
e. WHAT TYPE OF CELLS ARE BACTERIA? _______________
f. WHAT TYPE OF CELLS ARE ALL OTHER ORGANISMS? _______________
g. WHERE DID EUKARYOTIC CELLS COME FROM?
h. Hypothesis: __________________
Endosymbiont Hypothesis
a. Evidence:
a.
b.
c.