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7 Cards in this Set
- Front
- Back
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Which of these is evidence for the endosymbiont theory? |
Mitochondria and chloroplast contain their own circular DNA. |
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What evidence is there that modern archaebacteria may be most like the hypothesized earliest cells on Earth? |
Archaebacteria thrive in extreme environments of intense heat or pressure, and microfossils suggest early life forms lived in volcanic environments. |
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While looking for fossils in an eroded hillside, you discover fossil coral and fish in one layer. In a layer just above, you find the fossil imprint of a fern frond and some fossil moss. Assuming the rock has not been disturbed, which I the following is the most probable conclusion? |
In ancient times a sea had been replaced by land. |
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What was the source of the original atmosphere of early Earth? |
Volcanoes |
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What assumption must be made to calculate an age using radiometic dating? |
The amount of the isotopes preset in the material when it formed. |
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A researcher samples bat guano (droppings) that has built up in a 2-meter layer on the floor of a cave. At a depth of 0.75 m, the analysis shows only 25% of the original amount of carbon 14 left. Recalling that the half-life of carbon 14 is 5,730 years, how old is the guano at that level? |
11,460 years old |
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What criterion would you predict will be used to divide the Cenozoic from the next era in the future? |
A mass extinction |
