: Evolution explains both the unity and the incredible diversity of life on Earth. Through natural selection, organisms develop adaptations that improve their chances of survival and reproduction.
Despite its breadth, several unifying concepts govern all biological research: Biology
: The cell is the fundamental unit of all living things. Some organisms, like bacteria, consist of a single cell, while others, like humans, are made of trillions. : Evolution explains both the unity and the
: All living things must capture and transform energy to survive—whether through photosynthesis in plants or consumption in animals. They must also maintain homeostasis , a stable internal environment despite external changes. Major Branches of Biology consist of a single cell