Chapter 25
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Stromalites | the first single-celled organisms and the oldest known fossils; rocks formed by the accumulations of sedimentary layers on bacterial mats.
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| oxygen revolution | from 2.7 to 2.3 billion years ago caused the extinction of many prokaryotic groups.
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| endosymbiotic theory | proposes that mitochondria and plastids (chloroplats and related organelles) were formerly small prokaryotes living within larger host cells.
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| endosymbiont | a cell that lives within a host cell.
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| serial endosymbiosis | supposes that mitochondria evolved before plastids through a sequence of endosymbiotic events.
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| the "snowball Earth hypothesis" | suggests that periods of extreme glaciation confined life to the equational region or deep sea vents from 750 to 580 million years ago.
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| Ediacaran biota | an assemblage of larger and more diverse soft-bodied organisms that lived from 575 to 535 million years ago.
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| Cambrian explosion | the sudden appearance of fossils resembling modern animal phyla in the Cambrian period (535 to 525 million years ago).
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| Permian extinction | the boundary between the Paleozoic and Mesozoic eras 251 million years ago.
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| Cretaceous mass extinction | 65.5 million years ago separates the Mesozoic from the Cenozoic; caused the extinction of the dinosaurs
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| adaptive radiation | the evolution of diversely adapted species from a common ancestor.
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| heterochrony | an evolutionary change in the rate or timing of developmental events
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| paedmorphosis | the rate of reproductive development accelerates compared with somatic development.
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| homeotic genes | determine such basic features as where wings and legs will develop on a bird or how a flower's parts are arranged.
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| hox genes | a class of homeotic genes that provide posotional information during development.
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| binomial | the two part scientific name of a species.
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| epithet | unique for each species within the genus.
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| taxon | the taxonomic unit at any level of hierarchy.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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