She is TESL certified and also has her ESL ABQ Part 1. The lesson she shares here works well for students taking the ecosystems unit as part of the Grade 9 science curriculum. Students are typically 13 to 15 years old. It can also be used in whole or in part to teach the Grade 7 ecosystems unit (for ages 11-13). Victoria uses this lesson in her ESL Math/Science class, which focuses mainly on learners between Levels 1 and 3, although it may include Levels 4 and 5. Because students work together, those at Level 2 or Level 3 help Level 1 learners, who can still be active participants and feel successful.