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The ice on the front windshield of the car had formed when moisture condensed during the night. The ice melted quickly after the car was warmed up the next morning because the defrosting vent, which blows on the front windshield, was turned on full force.Which of the following, if true, most seriously jeopardizes the validity of the explanation for the speed with which the ice melted?A) The side windows had no ice condensation on themB) Even though no attempt was made to defrost the back window, the ice there melted at the same rate as did the ice on the front windshield.C) The speed at which ice on a window melts increases as the temperature of the air blown on the window increasesD) The warm air from the defrosting vent for the front windshield cools rapidly as it dissipates throughout the rest of the carE) The defrosting vent operates efficiently even when the heater, which blows warm air toward the feet or faces of the driver and passengers, is on

Question

The ice on the front windshield of the car had formed when moisture condensed during the night. The ice melted quickly after the car was warmed up the next morning because the defrosting vent, which blows on the front windshield, was turned on full force.Which of the following, if true, most seriously jeopardizes the validity of the explanation for the speed with which the ice melted?A) The side windows had no ice condensation on themB) Even though no attempt was made to defrost the back window, the ice there melted at the same rate as did the ice on the front windshield.C) The speed at which ice on a window melts increases as the temperature of the air blown on the window increasesD) The warm air from the defrosting vent for the front windshield cools rapidly as it dissipates throughout the rest of the carE) The defrosting vent operates efficiently even when the heater, which blows warm air toward the feet or faces of the driver and passengers, is on

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Solution

The statement that most seriously jeopardizes the validity of the explanation for the speed with which the ice melted is B) Even though no attempt was made to defrost the back window, the ice there melted at the same rate as did the ice on the front windshield.

This statement suggests that the defrosting vent blowing on the front windshield may not be the primary reason for the quick melting of the ice. If the ice on the back window, which was not directly exposed to the defrosting vent, melted at the same rate as the front windshield, then there must be another factor contributing to the melting of the ice. This could be the overall increase in temperature inside the car or the external weather conditions. Therefore, this statement challenges the original explanation.

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