Individual organism:How do structure, physiology,and behavior lead to the individual's survival and reproduction? Population:What determines the number of individuals and their variation in time and space? Community:What determines the diversity and relative abundance of organisms living together? Ecosystem:How do energy and matter move in the biotic and abiotic environment? Biosphere:How do air,water,and the energy and chemicals they contain circulate globally?• Individual organism: How do structure, physiology, and behavior lead to the individual’s survival and reproduction? • Population: What determines the number of individuals and their variation in time and space? • Community: What determines the diversity and relative abundance of organisms living together? • Ecosystem: How do energy and matter move in the biotic and abiotic environment? • Biosphere: How do air, water, and the energy and chemicals they contain circulate globally?