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Fossils and Evolution
Fichas del conjunto (26)
- 1EvolutionThe process by which changes occur in population of organisms over time
- 2Survival of a speciesdepends on reproduction
- 3Natural Selectioncompetition and environmental pressures
means that individuals with adaptions that are best suited to an environment are more likely to survive and reproduce, passing the adaptions to the offspring (Survival of the Fittest) - 4Changes in Environment can be fromPhysical conditions
Chemical conditions
Competition for resources - 5Varietythere is variety in all populations
variety can be inherited and passed on - 6Offspringmore offspring that can survive are reproduced as parents with bad adaptions die
charecteristics increase - 7isolation and new speciesnew species form due to environmental presures
if a population is isolatd and groups are seperated, new species can arise due to different selective pressures
isolated populations become different species when they cannot interbreed - 8evidence for evolutioncomparative dna
comparative embryology
comparative anatomy
biogeography
fossil records - 9FossilspRESERVED EVIDENCE OF LIVING ORganisms in rocks and soil
- 10PaleontologyStudy of the past life
- 11Paleontologistsreconstruct envirnments using fossils and geology
- 12what can fossils tell scientistsspeed
size
food they ate
where they lived - 13where and how do are fossils preservedsedimentary rock
layers cover fossil, decreasing oxygen meaning less decomposition
compression, cementation, compaction - 14absolute datingradioactive isotopes used
the decay of the isotopes form stable elements at rates called half lifes
10 half lifes before isotope is used up - 15original fossilsame chem composition as when living
- 16replacement fossilwhen a part of fossil chemically changes into another material
- 17carbon film fossilwhen a dead body partially decays and leaves a thin black carbon layer
- 18indirect fossilpreserved main parts of things
- 19mouldimprints
- 20castwhen an organism in a rock dcomposes and the space fills with soil and turns to rock
- 21permafrostpermanently frozen land
- 22ambersolid plant gum or sap
- 23tarpits occur when oil seeps onto land
- 24peatpartly decomposed remains of plants found in bogs or swamps
- 25dry airextremely dry conditions
- 26Riversleighcontains more than 250 sites that are rich with fossils.
home to one of the world’s reichest Oligo-Miocene mammal records, providing fossils from the middle to late Tertiary period
Queensland
bat fossils
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- Fichas sobre Fossils and Evolution, creado por Calista Kusuma el 06/05/2015.
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