Question

in regard to isotopes, compare and contrast low and high level radiation by indicating which statement applies to which level of radiation. used as a tracer by which to detect molecular changes. used for many years to sterilize medical and dental products can damage dna can harm or kill cells can cause cancer been used to sterilize the u.s. mail to free it of possible pathogens high and low level radiation low level radiation high level radiation

Explanation:

Low - level radiation is often used as a tracer for detecting molecular changes and has been used for years to sterilize medical and dental products. High - level radiation can damage DNA, harm or kill cells, cause cancer, and has been used to sterilize U.S. mail to eliminate possible pathogens.

Answer:

Low Level Radiation: used as a tracer by which to detect molecular changes, used for many years to sterilize medical and dental products
High Level Radiation: can damage DNA, can harm or kill cells, can cause cancer, been used to sterilize the U.S. mail to free it of possible pathogens