Name and page numbers
YouTube Link
Levels of the Biosphere
pgs.123-124

https://www.youtube.com/watch?v=NaEL3VGQx4E
Biogeochemical Cycles
pgs.125-126

https://www.youtube.com/watch?v=CJKwSMnClfk
Biotic Relationships and Population Growth
pg. 127

https://www.youtube.com/watch?v=P5ZltEvkVR0
Human Population Growth
pgs. 131-132

https://www.youtube.com/watch?v=ida3f4V5u54
Environmental Problems
pgs. 133-134
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https://www.youtube.com/watch?v=RIr1AmRf8mc