This reading is OPTIONAL and meant to further enrich your understanding of the material and/or assist you with your unit activities. The different sections and chapters from the course textbook have been aligned with the sequence of Dr. Hartnell's units. No assignments are associated with this reading. Enjoy!
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(NOTE: These are the only Lessons from Chapter 21 that you need to read at this time. You will read the other Lessons in Unit #6.)
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