The "Foundations of Living Systems" refers to the basic principles and structures that support life. This includes the study of cells, which are the fundamental units of life, and DNA, the molecule that carries genetic information. Understanding these components helps explain how organisms grow, reproduce, and respond to their environment. Additionally, living systems are organized into various levels, from molecules and cells to tissues, organs, and entire organisms. Each level interacts with others, forming complex networks that sustain life. This interconnectedness is essential for maintaining homeostasis and ensuring the survival of species in diverse ecosystems.