through all of the topics in the lesson guide, then continue
to the activity and posttest.
way that toxic substances can enter your body is through the
skin or integument. Harmful environmental
substances that enter our bodies mainly through the skin are numerous.
You should know that infant's and small children's skin is
thinner than adults and therefore more susceptible to the hazards
described in this lesson.
of the most common are pesticides/herbicides, parasites and even
the lesson guides to learn more.