Unit 1: The Living World: Ecosystems · Lesson 2

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Primary productivity, trophic levels and energy flow and the rest of the free lessons open with an account. Your progress saves to it.

• Practice exam 1 with a free account
• The free 15-question diagnostic
• The calculation drill
• Three lessons
• Unit 1 practice
• Three free-response questions with Mia's feedback
• The calculator and the study planner