This lecture is part of the module "Demo-genetics in a Changing Environment" for M1 students in the Master Green EEAE (Evolutionary Ecology in Aquatic Environments) program at UPPA. The lecture introduces key concepts in eco-evolutionary dynamics, drawing from Hendry, A. P. (2017). Eco-evolutionary Dynamics. Princeton University Press. This second part focuses on the evo-to-eco aspect of eco-evolutionary feedback (EEF) loops. Based on slides by D. Claessen (ENS Paris), the lecture first defines the concept of the "struggle for existence." The simple model of logistic population growth is used to illustrate how evolution can influence population dynamics. Next, some limitations of this simple model are discussed, and the lecture also covers practical methods for detecting evolutionary effects on population dynamics. Finally, the lecture addresses major scientific questions related to selection in nature, including: To what extent does maladaptation cause population declines? How quickly and to what extent does adaptation increase individual fitness? How does adaptation influence population growth? Does adaptation enable evolutionary rescue? Does adaptation facilitate range expansion? Does intraspecific diversity affect population dynamics?