Unit Test — Unit test Answers

Fossil age can determine organism changes related to the time scale.

90 % of marine organisms and 70% of land organisms died off due to environmental and/or climate changes during the Paleozoic Era.

Actual age refers to the relative age, while comparison age refers to absolute age.

What are the types of unconformities that can occur in rock layers?a.angularc.nonconformity b.disconformityd.all of the above

The breakup of Pangea caused climate changes that caused organisms to adapt or die off, this occured during the Paleozoic era.

Compare and contrast disconformities and nonconformities.

Fossils provide scientists with evidence that allows them to hypothesize how living organisms have evolved over time. Tiktaalik roseae was a unique organism that has been nicknamed the “fishapod” because it is believed to be a species had traits of both fish and tetrapods, the first four-legged animals.Which evidence would scientist use to make the connection between ancestry of fish and tetrapods using Tiktaalik roseae?

Explain what is meant by correlating rock layers.

Order the units or geologic time from the longest to the shortest: Era, Period, Epoch, Eon.

Compare relative age with absolute age.

How long ago did Homo sapiens first appeared in the fossil record? Identify the era in which this occurred.

Figure 13-2

Describe alpha decay.

Carbon-14 has a half life of about 5700 years. How useful is it in dating ancient fossils?