Explore the foundations of biology: cells, genes, organisms, and ecosystems.
This section introduces the foundations of biology: how living systems store information, process energy, and maintain organization from cells to ecosystems. By the end, you’ll be able to reason about biology conceptually through patterns, practice, and real examples.
Pick a concept to start. Each one can have intuition, practice, and applications.
Membranes, organelles, and how cells stay alive.
Start here →Inheritance, variation, and how information flows.
Start here →Bacteria, viruses, and the invisible ecosystem around us.
Start here →Systems that keep organisms stable and functioning.
Start here →Selection, drift, and why biology has patterns at all.
Start here →Energy flow, cycles, and interactions across scales.
Start here →Explore a real-world theme that ties multiple concepts together.
Immunity, pathogens, and why systems fail (or adapt).
Explore →Signals in nervous systems and what they produce.
Explore →Selection, resistance, and population change over time.
Explore →Food webs, cycles, and ecological responses to change.
Explore →Immunity, pathogens, and why systems fail (or adapt).
Explore →Signals in nervous systems and what they produce.
Explore →Selection, resistance, and population change over time.
Explore →Food webs, cycles, and ecological responses to change.
Explore →