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Exam 15: Tracing Evolutionary History

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Question 21

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Potassium- 40 can be used to date that are _ _ old.

A) carbon- containing materials ...up to 75,000 years
B) potassium- rich fossils ...millions of years
C) volcanic rocks and associated fossils ...hundreds of millions of years
D) fossils ...thousands of years

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Question 22

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The earliest known land plants date to the

A) Jurassic (Mesozoic era) .
B) Precambrian.
C) Carboniferous (late Paleozoic era) .
D) Ordovician (early Paleozoic era) .

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Question 23

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If all of Earth's history were compressed into an hour,humans would first appear less than

A(n) has been used to estimate that HIV- 1 M first spread to humans in the 1930s.

Geological evidence indicates that two land masses became separated by a deep ocean channel 45 million years ago and have been moving apart ever since.You are studying a group of organisms that is widespread as a native part of the biota on both of the land masses.What can you conclude about the group's evolutionary history?

The earliest discovered fossils are of dating back to years ago.

How can a phylogenetic tree be used to make predictions?

If an isotope has a half- life of 4 million years,and a fossil is 16 million years old,how much of the original isotope will be found in the fossil?

Which of the following statements regarding genetics is false?

The existence of nest- building in crocodiles and birds led to a prediction that this behavior was also present in .

A spot where two continental plates are sliding past one another may be prone to

Molecular data can be used to assess relationships among the major groups of living organisms whose common ancestors lived millions or billions of years ago.Similar techniques can be used to assess relationships among populations within a species.How can molecular techniques be useful for such varied comparisons?

Which of the following lines of evidence suggests that lungfishes evolved while Pangaea was intact?

Which highly reactive gas was probably absent from the Earth's primitive atmosphere?

Which of the following options lists taxonomic categories in the correct order from most specific to most general?

Anti- evolutionary thinkers sometimes argue that natural selection could not produce a complex structure like the vertebrate eye.They claim that all of the parts of the eye must have arisen at once,asking why natural selection would favor the development of part of an eye that is not yet capable of forming a focused image.Which of the following statements is consistent with a survey of eye structure in the molluscs?

You find the frozen remains of a woolly mammoth in an Alaskan glacier.You analyze a bit of the tusk and find that its 14C:12C ratio is about one- fourth (25%) of the baseline level typically found in living organisms.Given that the half- life of 14C is 5,730 years,when did the mammoth die?

The Himalayas are an example of a mountain range formed as a result of

According to this figure,during what time frame was there an adaptive radiation of eutherians?

According to this figure,if a species were found only in Laurasia 135 million years ago,on which modern continents would its descendants most likely be found today?