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13.2 Biotic and Abiotic Factors KEY CONCEPT Every ecosystem includes both living and nonliving factors. 13.2 Biotic and Abiotic Factors Biotic Factors. • • • • • Biotic factors are living things. plants animals fungi bacteria plants 13.2 Biotic and Abiotic Factors Abiotic Factors. moisture • Nonliving things. – – – – – moisture temperature wind sunlight soil soil sunlight 13.2 Biotic and Abiotic Factors Biodiversity • Biodiversity is the assortment, or variety, of living things in an ecosystem. Tropical rain forests have the most biodiversity than other locations in the world. 13.2 Biotic and Abiotic Factors Keystone Species • Keystone species form and maintain a complex web of life. Which organism holds the keystone?