Fossil Records Flashcards
A natural cast forms….
When flowing water removes all of the original tissue, leaving an impression
Permineralzation occurs…
Minerals carried by water are deposits around a hard structure
Trace fossils record…
The activity of an organism
Amber preserved fossils are…
Organisms that becomes trapped in tree resin that hardens after the tree is buried
Three processes that have affected life history
- Plate Tectonics
- Collision of asteroids
- Photosynthesis: production of O2 by photosynthetic bacteria
Two ways in which continental drift has affected organism
Collision of land masses
Radiometric dating
Uses decay of unstable isotopes
Hypothesis on how earth was made
Most widely accepted is the Nebula Hypothesis
Miller- Urey Experiment
Made premature earth and make building blocks of earth.
Meteorite Hypithesis
Crashed into earth w living organism
Early earth atmosphere
Has CO2, N, H2O, less than 1% oxygen
Miller and ureys experiment for early life
Made bio molecules and building blacks for life
Ex. AA, lipids, carbs,
Multicellular organisms appeard during the ….
Paleozoic era
The Paleozoic era began ___ million years ago and ended ___ million years ago
544
248
The ________ _______ led to huge diversity if animal species
Cambrian Explosion
Life moves _____ ____ in the middle of Paleozoic era
Into land
The ______ ____ is known as Age of Reptiles. It’s began ___ million years ago and ended __ million years ago
Examples________
Mesozoic Era
248
65
Dinosaurs, birds, flowering plants, first mammals appeared
The ______ ___ began 65 million years ago and continues today
Placenta mammals and _____ evolved and diversified
Cenozoic era
Monotremes
