Blue text shows extra clarification or guidance.Guiding questionsSL & HL (4 hours)B4.2.1 - Ecological niche is the role of a species in an ecosystem. It includes the biotic and abiotic interactions that influence growth, survival and reproduction, including how a species obtains food.B4.2.2 - Different tolerance of organisms to oxygen in their environment gives terms, obligate anaerobes, facultative anaerobes and obligate...