The end of the Permian period approximately 250 million years ago coincides with a significant biological event; at that time
A) dinosaurs first evolved into mammals.
B) terrestrial plants first appeared.
C) the glacial and interglacial cycle that continues today first began.
D) 80 to 90 percent of all marine species became extinct.
Correct Answer:
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Q1: During the past 30 years amphibians have
Q2: At least five mass extinction events have
Q4: Of the species humans have catalogued, most
Q5: Without places to live, Earth's biodiversity will
Q6: Human developments like housing, shopping centers, or
Q7: More than half of the presently identified
Q8: Attacked by chestnut blight, the American chestnut
Q9: Biologists have spent the past 200 years
Q10: Nonhuman species are
A) relatively expendable since other
Q11: The number of species of organisms on
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