Technician A says after tire service work tires and wheels must be in a state of static and dynamic balance in order to avoid vibration in service. Technician B says tires and wheels are balanced at the factory and do not need further balancing. Who is correct?

The arctic is a cold deset biome, which one of the answers is not correct? a) animals in cold deserts burrow to get out of the harsh climates. b) vegetation in cold deserts is normally shallow rooted small shrubs. c) animals in cold deserts hibernate most of the year to get out of the cold. d) soils are very heavy and course. e) the region receives less than 10 inches of precipitation annually.