ABOUT BOOK

This resource has been prepared for one semester of an introductory-level college biology course with foundational themes of evolution, ecology, and comparative body systems. The first unit explores the origins and defining characteristics of living things and compares the earliest and simplest life forms with more complex cellular life. One of the common features of all life is that it requires energy; the next section explores the why and how of energy acquisition and relationships between the metabolic pathways. After a primer on photosynthesis and energy production via respiration, the next few sections delve into the form and physiology of plants and animals, focusing on water and food transport in plants, and in the respiratory, circulatory, digestive and reproductive systems of diverse animals. These systems were selected to serve as an introduction to animal physiology because they can be easily interleaved with other core course concepts such as energy flow and nutrient cycling through ecosystems, population genetics, bioenergetics, or speciation. The final sections of the text provide a basis for understanding evolutionary change, biodiversity, and the history and relatedness of life on Earth.