Unit guide
Unit 2 · The Living World: Biodiversity
Follow the sequence below, and return to lessons whenever practice reveals a gap. Completing a lesson or a test is a learning checkpoint.
1. Diagnostic →
Try the pre-assessment before studying. Use missed concepts to plan your learning; this is a starting point.
2. Lessons and writing →
Study the unit’s concepts, work through examples and explain your reasoning in the available writing activities.
3. Post-assessment →
Check understanding after the unit’s lessons. Revisit explanations for missed concepts before testing again.
Spaced practice: return later →
On another day, recall the ideas before checking explanations. This is continuing review throughout the course.
After studying across units: full exams →
Next unit: Unit 3 · Populations →Cumulative exams combine the course’s units. Keep revisiting earlier units while learning the next ones. Practice percentages are not AP score predictions.