Positives

• The explanation of these concepts is clear and concise. 
• The graph shows students the actual rates of extinction compared to the "normal" background rate.
  

Additional Prerequisites

• It would help if students were familiar with the terms species, population, genetic diversity, natural selection, and evolution.

Differentiation

• Have students write a reflection paper about the complete loss of an entire species (disappearing from the Earth forever) and then have them discuss their ideas for how to stop the extinction crisis. 
• Connect this lesson to the ecological concept of sustainability using this animation of human civilization over time and this lesson plan about sustainable populations.
  
• Science classes could use this video when discussing other mass extinction events, the diversity of life, evolution, genetics, Earth's history, paleoclimate, population dynamics, or changes to ecosystems. 
• Social studies and history classes could incorporate this resource into lessons about world history from the 1500s, the Industrial Revolution, or globalization.
• To extend a lesson on this topic, consider using this video about how humans affect biodiversity, this article about the loss of wild mammals and birds, and this PBS video about the 6th extinction event.