In August 2010, about 500 million eggs were recalled by the government because its egg shells were contaminated with salmonella. This is an example of . a.
how toxic heavy metals can enter the environment through natural processes
b.
how persistent organic pollutants do not easily break down in the environment
c.
how chemicals can change reproductive processes in organisms
d.
how thermal pollution can cause the spread of a disease
e.
how transmission of infectious diseases can be through environmental factors