Which of the following statements is/are true? a. when the cold airmass following a cold front is moist and unstable, it is characterized by stratiform clouds and showery precipitation. b. a common in-flight hazard associated with warm fronts is precipitation induced fog. c. indicators of an approaching warm front are steady precipitation with cumuliform clouds. d. all the above

Which of the following statements proves that scientific knowledge changed due to the discovery of the fossil of a hadrosaur in north dakota? hadrosaurs were better runners than earlier thought. hadrosaurs had no pattern on their skin as expected. the length of the hadrosaur was shorter than previously thought. the muscular structure of hadrosaurs was less developed than expected.