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| 1. angiosperm Flowering plant |
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| archaebacterium Member of the prokaryotic domain Archaebacteria |
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| Archean eon Eon in which life arose (3.8-2.5 bya). |
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| big bang Model for origin of universe. |
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| Cenozoic era The present era (65 mya to present). |
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| crust, of Earth Outer zone of low-density rocks resting on the Earth's mantle. |
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| dinosaur One of a fabulous group of reptiles that originated in the Triassic and became the dominant land vertebrates for 125 million years. |
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| endosymbiosis theory Continuing physical contact between two species, one of which lives and reproduces inside the other's body. |
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| eubacterium Prokaryotic cell; has a nucleoid, but no nucleus, cytoplasm, or cell membrane; most have a cell wall, some encapsulated. |
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| eukaryotic cell Cell having a nucleus and other membrane-bound organelles. |
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| global broiling hypothesis Theory that an asteroid impact caused the K-T mass extinction. K-T asteroid impact theory A huge asteroid hit Earth at the K-T boundary. |
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| gymnosperm Type of vascular plant in which seeds form on exposed surfaces of reproductive struct |
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| mantle Of mollusks, a tissue draped over the visceral mass. |
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| Mesozoic era An era (240-65 mya) of spectacular expansion in the range of global diversity. |
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| prokaryotic cell Archaebacterium or eubacterium |
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| Paleozoic era Era from Cambrian, Ordovician, Silurian, Devonian, Carboniferous, through the Permian |
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| protistan Photoautotroph or heterotroph |
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| proto-cell Hypothetic cell-like stage between chemical evolution and the first living cell. |
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| RNA world One model for prebiotic evolution in which RNA was the template for protein synthesis before the evolution of DNA. |
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| stromatolite Fossilized mats of shallow-water microbial communities |
