2667051
Description
Flashcards by Calista Kusuma, updated more than 1 year ago
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Created by Calista Kusuma
over 9 years ago
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| Question | Answer |
| Evolution | The process by which changes occur in population of organisms over time |
| Survival of a species | depends on reproduction |
| Natural Selection | competition 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) |
| Changes in Environment can be from | Physical conditions Chemical conditions Competition for resources |
| Variety | there is variety in all populations variety can be inherited and passed on |
| Offspring | more offspring that can survive are reproduced as parents with bad adaptions die charecteristics increase |
| isolation and new species | new 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 |
| evidence for evolution | comparative dna comparative embryology comparative anatomy biogeography fossil records |
| Fossils | pRESERVED EVIDENCE OF LIVING ORganisms in rocks and soil |
| Paleontology | Study of the past life |
| Paleontologists | reconstruct envirnments using fossils and geology |
| what can fossils tell scientists | speed size food they ate where they lived |
| where and how do are fossils preserved | sedimentary rock layers cover fossil, decreasing oxygen meaning less decomposition compression, cementation, compaction |
| absolute dating | radioactive isotopes used the decay of the isotopes form stable elements at rates called half lifes 10 half lifes before isotope is used up |
| original fossil | same chem composition as when living |
| replacement fossil | when a part of fossil chemically changes into another material |
| carbon film fossil | when a dead body partially decays and leaves a thin black carbon layer |
| indirect fossil | preserved main parts of things |
| mould | imprints |
| cast | when an organism in a rock dcomposes and the space fills with soil and turns to rock |
| permafrost | permanently frozen land |
| amber | solid plant gum or sap |
| tar | pits occur when oil seeps onto land |
| peat | partly decomposed remains of plants found in bogs or swamps |
| dry air | extremely dry conditions |
| Riversleigh | contains 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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