🧰 APES Unit 3 Populations Mega Bundle for AP® Environmental Science covering human population dynamics, demographic transition model, population growth, survivorship curves, and species strategies. Unit 3 is where students learn to model how populations grow, stabilize, and decline under real environmental pressures. This comprehensive bundle builds mastery of human population growth, fertility rates, population pyramids, r- and K-selected species, survivorship patterns, carrying capacity, an