The History of Life on Earth
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Macroevolution | The pattern of evolution over large time scales, including photosynthesis, the emergence of terrestrial vertebrates, and the impact of mass extinction.
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How was life first formed on Earth? | The abiotic synthesis of small organic molecules; the joining of the particles to form macromolecules; the packaging of the macromolecules into protobionts; the origin of self-replicating molecules that eventually made inheritance possible.
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What was the Oparin-Haldane hypothesis? | Earth's early atmosphere was a reducing environment, in which organic compounds could have formed from simple molecules.
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Protobiont | A collection of abiotically produced molecules surrounded by a membrane-like structure, which exhibits the properties of life, including reproduction, metabolism, and homeostasis.
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Ribozyme | An RNA catalyst, which made complementary copies of short RNA pieces, when it was supplied with nucleotide building blocks.
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Radiometric Dating | A common technique for dating fossils, which is based on the decay of radioactive isotopes expressed through half-lives.
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What is the order of mammalian evolution? | Early tetrapods, synapsids, therapsids, early cynodonts, later cynodonts, and very late cynodonts.
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Geologic Record | The history of the Earth, which is divided into eons, eras, periods, and epochs.
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What are the three eons from earliest to latest? | Archaean, proterozoic, phanerozoic.
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What are the three eras from earliest to latest? | Paleozoic, Mesozoic, Cenozoic.
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What are the twelve periods from earliest to latest? | Ediacaran, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Paleogene, and Neogene.
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What are the seven epochs from earliest to latest? | Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Holocene.
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Endosymbiosis | A model explaining how eukaryotes evolved from prokaryotes, which contests that the mitochondria and plastids were small prokaryotes living within larger cells, after being consumed with food.
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Endosymbiont | A cell that lives within another cell.
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Host Cell | The cell that hosts the endosymbiont.
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Serial Endosymbiosis | A model of eukaryotic evolution from prokaryotes, which suggests that the mitochondria evolved before plastids through a sequence of endosymbiotic events.
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What is the model for serial endosymbiosis? | An ancestral prokaryote infolds its plasma membrane to form an endomembrane system, engulfs an aerobic heterotrophic prokaryote that develops into a mitochondrion, which becomes an organelle along with the photosynthetic prokaryote that becomes a plastid.
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What is some of the evidence supporting the endosymbiotic origin of mitochondria and plastids? | The inner membranes have homologous enzymes and transport systems, they replicate similarly to prokaryotes
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Cambrian Explosion | The rapid appearance of many different phyla, including the first hard-bodied animals, of living animals during the Cambrian period.
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Continental Drift | The movement of the plates, which lie beneath the continents and cause the continents to move closer or farther from one another.
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Pangaea | The supercontinent from which all the continents separated and formed.
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What are the effects of continental drift? | It alters the habitats in which species live, changes the climate of the continent, promotes allopatric speciation, and explains puzzles about geographic distribution of extinct animals.
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Mass Extinction | When a disruptive, global, environmental change cases the rate of extinction to increase dramatically, causing several species to become extinct throughout the Earth.
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What are the consequences of mass extinctions? | It reduces an ecological community to a shadow of itself and permanently ends evolutionary lineages.
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Adaptive Radiation | A period of evolutionary change in which groups of organisms form many new species whose adaptations allow them to fill different ecological niches in their communities, and it often occurs on a large scale following a mass extinction.
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Heterochrony | An evolutionary change in the rate or timing of developmental events relative to reproductive or non-reproductive organs, which can determine certain aspects of the developing individual.
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Paedomorphosis | A condition in which reproductive-organ development accelerates compared to other organs, so the sexually mature stage of a species may retain features of the juvenile form of the ancestral species.
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Homeotic Gene | A master regulatory gene that determines the placement and spatial organization of body parts in a developing organism.
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Exaptation | A structure that evolves in one context, but becomes co-opted for another function.
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Species Selection | The model of long-term evolutionary trends proposed by Steven Stanley, which states species that endure the longest and generate the most new offspring species determine the direction of major evolutionary trends.
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