All of the substances are which cause inheritable changes in genetic material.
a) agents
b) mutagens
c) pathogens
d) vectors

The need activity of the nurse is to suction discharges from the trachea. current treatment approaches in the pressing consideration facilities or crisis offices are corticosteroids and nebulized epinephrine; steroids have demonstrated advantageous in extreme, direct, and even gentle croup. in the clear instances of croup, anti-microbials are not endorsed, as the etiology is viral

4) repetitive change