What is the evidence that dinosaurs were endotherms? What is the evidence that they were
ectotherms? What is the conclusion? What will be an ideal response?
Bones of endotherms typically have numerous passageways that contain blood vessels, but ectotherm
bones contain fewer passageways. Some dinosaur fossils have bones like endotherms, but they are
ectotherms. Endotherms must eat more than ectotherms because they have a higher metabolic rate, so
endothermic predators would require more prey. While it is difficult to tell, dinosaur predators make
up 3% to 5% of the total population, in line with their being predators. Large-brained animals are
endothermic to keep the brain at constant body temperatures. Some dinosaurs had large brains,
especially small- and medium-sized carnivores, but many did not. Theropods in China have been
found with feathers, and today only endotherms have this insulation. It is likely that large sauropods
were ectothemic, but many theropods and some ornithopods were likely endothermic.
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Frontal lifting:
A) is not related to temperature differences between air masses. B) leads to increased pressure on the warm front. C) can act in a way that is analogous to orographic lifting. D) is most pronounced when a cold front meets a cold front.
How many television advertisements has the average American seen by the age of 20?
A) 50 thousand B) 100 thousand C) 250 thousand D) 500 thousand E) One million
Between 1900-1940
A) the Great Plains became a destination for immigrants. B) coastal Atlantic cities, especially southern cities, began to grow rapidly. C) oil towns of Houston and Los Angeles grew exponentially. D) immigrants bypassed the plains going directly to the West Coast. E) high numbers of Asian immigrants arrived on the West Coast.
Most of the weather happens in the ________.
A. troposphere B. atmosphere C. stratosphere D. mesosphere E. thermosphere