Chapter 12 Vocab
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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| relative dating | estimate of the age of a fossil based on the location of the fossil in strata
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| radiometric dating | technique that uses the natural decay rate of isotopes to calculate the age of material
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| isotope | form of an element that has the same number of protons but a different number of neutrons as another element
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| half-life | amount of time it takes for half of the isotope in a sample to decay into its product isotope
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| index fossil | fossil of an organism that existed during only specific spans of geologic time across large geographic areas
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| geologic time scale | time scale representing the history of Earth
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| era | second largest unit of geologic time, lasting tens to hundreds of millions of years and consisting of two or more periods
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| period | unit of geologic time that lasts tens of millions of years and is associated with a particular type of rock system
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| epoch | smallest unit of geologic time, lasting several million years
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| nebula | rotating cloud of gas and dust
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| ribozyme | RNA molecule that can catalyze specific chemical reactions
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| cyanobacteria | bacteria that can carry out photosynthesis
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| endosymbiosis | ecological relationship in which one organism lives within the body of another
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| Paleozoic | era of geologic time (from 544-248 million years ago) during which members of every major animal group alive today evolved
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| Cambrian explosion | earliest part of the Paleozoic era, when a huge diversity of animal species evolved
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| Mesozoic | era during which dinosaurs roamed Earth (from 248 million years-65 million years ago)
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| Cenozoic | geologic time period that began 65 million years ago and continues today
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| primate | mammal with flexible hands and feet, forward-looking eyes, and enlarged brains relative to body size
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| prosimian | oldest primate group that includes mostly small, nocturnal primates such as lemurs
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| anthropoid | humanlike primate
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| hominid | primate group that includes orangutans, chimpanzees, gorillas, and humans, as well as their immediate ancestors
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| bipedal | animal that walks on two legs
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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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