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Almost every organism that has ever lived died and decomposed without leaving any lasting trace. The tiny fraction that were preserved, as *fossils

Evolution doesn't always produce a simple, ever-branching tree of increasing difference. Sometimes distantly related species end up looking remarkabl

Every species alive today descends from earlier species that no longer exist in their original form. Speciation is the process that connects one

Few ideas in science have been as consequential, or as widely misunderstood, as natural selection. First described in detail by Charles Darwin in

Every living organism is built from one of two fundamentally different kinds of cells. Prokaryotic cells, found in bacteria and archaea, are simp

A multicellular organism only works if its cells act as a coordinated whole rather than trillions of independent units doing their own thing. **Cell