Which region was tectonically active during the cenozoic era?
the atlantic coast
eastern north america
western north america
the gulf coast

western North America

Explanation:

The Cenozoic Era began 65 million years ago and lasts to the present. It means "new life" and is also known as the Age of Mammals. It is in this era that the current man, Homo Sapiens and technology emerges.

The Cenozoic Era is marked by widespread development on all continents, especially in low-lying plains, such as the Gulf and Atlantic coastal plains of North America. In addition, in that period Western North America was marked by being tectonically active.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

the answer is c. altitude. hope this ! #brainiac