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25 Cards in this Set
- Front
- Back
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Sedimentary rock is formed from
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small particles of sand, silt, and clay.
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What proportion of all species that ever lived has become extinct?
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more than 99 percent
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To be useful as an index fossil, a species must have existed for a
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short period over a wide geographic range.
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The basic divisions of the geologic time scale from larger to smaller are |
eras and periods.
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The Mesozoic Era occurred
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after the Paleozoic Era.
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Which of the following was NOT characteristic of Earth before the oceans formed?
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an atmosphere containing oxygen gas
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Two gases that probably existed in Earth’s early atmosphere are
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hydrogen cyanide and carbon monoxide.
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What prevents organic molecules from forming on their own and remaining intact today?
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Atmospheric oxygen is too reactive.
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One necessary condition for the evolution of the first life on Earth was
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the presence of liquid water.
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Which of the following functions can RNA perform under certain conditions?
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all of the above
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Why did the development of sexual reproduction speed up the process of evolution?
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Sexual reproduction increases genetic variety
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What was the response of the various groups of early organisms that existed when oxygen levels rose in the atmosphere?
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all of the above
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Examples of fossils include preserved
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all of the above
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Most fossils form in
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sedimentary rock.
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The length of time required for half of the radioactive atoms in a sample to decay is its
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half-life.
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To compare the relative ages of fossils, scientists sometimes use an easily recognized species called a(an)
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ndex fossil.
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Earth’s most recent era is the
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Cenozoic.
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Why did oceans not exist on Earth nearly 4 billion years ago?
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Water remained a gas because Earth was very hot.
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In addition to hydrogen, two of the gases used in Miller and Urey’s experiment were
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methane and ammonia.
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When oxygen was first released in the early seas, it combined with iron to form
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rust.
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The first organisms on Earth were most like today’s
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bacteria.
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A very large mass extinction in which trilobites and amphibians disappeared occurred at the end of the
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Paleozoic Era.
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During the Jurassic and Cretaceous periods, the dominant land animals were
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dinosaurs.
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A single species that has evolved into several different forms that live in different ways has undergone
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adaptive radiation.
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Sharks, dolphins, and penguins all have streamlined bodies and appendages that enable them to move through water. These similarities are the result of
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convergent evolution.
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