Discover how living things are built, function, change, and interact.
Explore biology through cells, genetics, evolution, organisms, ecosystems, and scientific investigation.
Cells are the basic units of life.
Learn MoreGenes are segments of DNA that influence traits by guiding protein production.
Learn MorePopulations change over generations through mutation, natural selection, genetic drift, and migration.
Learn MoreMulticellular organisms coordinate tissues, organs, and body systems.
Learn MoreOrganisms interact with one another and with water, air, soil, and climate.
Learn MoreBiologists observe, compare, experiment, model, and analyze data.
Learn MoreCells are the basic units of life. Their membranes control exchange, DNA stores instructions, and specialized structures carry out energy use, construction, transport, and division.
Genes are segments of DNA that influence traits by guiding protein production. Inheritance combines genetic information from parents, while mutation creates new variation.
Populations change over generations through mutation, natural selection, genetic drift, and migration. Shared features and DNA reveal relationships among species.
Multicellular organisms coordinate tissues, organs, and body systems. Homeostasis keeps internal conditions within ranges that cells can tolerate.
Organisms interact with one another and with water, air, soil, and climate. Energy flows through food webs while matter cycles through ecosystems.
Biologists observe, compare, experiment, model, and analyze data. Ethical research and careful controls help distinguish reliable conclusions from coincidence.