Particular care must be taken when using radiation for medical imaging. this is the result of radiation's ability to create in human tissue and possible biochemical changes. a. ionizations b. radio waves c. sound waves d. thermal changes

This is the result of radiation's ability to create ionizations in human tissue and possible biochemical.  Exposure to any amount of ionizing radiation are always a risk of damage to cells or tissues being exposed. The exposure to radiation may cause cancer and other health problems.  However, the risk of getting cancer from being exposed to small amounts of radiation is minimal. 

The answer would be dogs.