Semester 2, Day 13
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Transcript of Semester 2, Day 13
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Semester 2, Day 13
Fossil Evidence of Evolution
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Agenda Review for Quiz on Speciation and Isolation Turn in Homework Take Quiz on Speciation and Isolation Lecture on Fossil Evidence of Evolution Break Reading/Work Time
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Review for Quiz on Isolation and Speciation Gradualism theory of evolution (from book) Punctuated equilibrium definition (from book) Definition and Process of Speciation Definition of Prezygotic and Postzygotic
Isolation Types of Isolation. Are they Pre or Post?
Understand definitions and examples Behavioral, Gametic, Hybrid Inviability, Habitat
Isolation, Hybrid Breakdown, Geographical, Spatial, Mechanical, Hybrid Sterility, Temporal
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Homework Due Cornell Notes on Section 15.2 Pg 409-413 Questions:
15.2 #2-5 Chapter 15 Assessment #3, 4, 8, 11, 15, 21-24
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Take Quiz Silence during quiz Eyes on your own paper Flip over when finished
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Fossil Evidence of Evolution
Part 1: Theory
Part 2: Evidence
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Fossil Evidence of Evolution Fossil: preserved evidence of an org.
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Fossil Evidence of Evolution Trace Fossil: Indirect evid. left by org. (footprints, burrows,
fossilized feces)
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Fossil Evidence of Evolution Mold Fossil: Impression of an org.
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Fossil Evidence of Evolution Cast Fossil: Mold filled w/ sediment
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Fossil Evidence of Evolution Replacement Fossil: Original material replaced by crystals,
detailed replicas
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Fossil Evidence of Evolution Petrified Fossil: Empty pore spaces filled in by
materials
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Fossil Evidence of Evolution Amber Fossil: Preserved tree sap traps entire org . Hardens
into amber.
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Fossil Evidence of Evolution Original Material Fossil: Mummification or freezing preserves
original orgs.
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Fossil Evidence of Evolution Most decompose before fossilized
Those rapidly buried in sediment are preserved Sediment: minerals or organic matter (dirt, sludge, etc.)
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Fossil Evidence of Evolution Drawing
Igneous Rocks: magma cools Metamorphic Rocks: extreme heat & pressure Sedimentary Rocks: minerals & sediment accumulate
Nearly all fossils are SEDIMENTARY (can’t survive ht or pres.)
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Fossil Evidence of Evolution Fossil Record: fossils in earth’s layers; major
events in hist. of life. Strata: dif. rock layers
Same age strata have same fossils no matter where layer is
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Fossil Evidence of Evolution Fossil Record (cont.)
Dramatic speciation after mass extinctions Mass Ext.: many species die out at once Speciation: new species evolve
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Fossil Evidence of Evolution Based on fossil record, scientists think that:
The earth is ~4 bil. yrs old
Dating Fossils Relative Dating (LAW OF SUPERPOSITION)
Old strata below new strata
Radiometric Dating Decay of radioactive chemicals
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Fossil Evidence of Evolution Work Sheet
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Fossil Evidence of Evolution Geologic Time Scale: major geo. & bio. events
in Earth’s hist.
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Precambrian
1st life = ~3.4 bil. yrs.
87%
Beg: 1 cell
prokaryotes (no
nucleus)
End: multi Cellular
eukaryotes
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Cambrian Explosion of
ocean animals, “Age of Marine
Life”
“Age of Reptiles”
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Mass Extinction of marine
animals (90%)
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Mass Extinctionof dinosaurs
“Age of Dinosaurs
“Age of Mammals”
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Fossil Evidence of Evolution Think about a year…
Jan Feb Mar Apr May June Precambrian
July August Sept Oct Nov Dec
Precambrian Paleozoic
Mesozoic
Cenozoic
HumansJan Mid-Oct
Mid-Oct Dec 10
Dec 10 Dec 26
Dec 26 Dec 31
Evening on Dec 31st
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Fossil Evidence of Evolution Pangaea
Began as 1 land mass Sep. over time
Orgs. on dif. continents can be very similar Will meet on other side to make a new
supercontinent
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Fossil Evidence of Evolution Amasia: collision of North America and Asia
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BREAK
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Reading/Work Time Cornell Notes Section 14.1 pgs. 375-379 Questions:
14.1 #1-5 Chapter 14 Assessment #3, 6, 9, 10, 12, 18-20
Remember! 3 out of 5 checked for accuracy and completion Less than 3/5 on HW = 0 on quiz until corrected