Three cell division types at Cell growth, by JWSchmidt

Diagram summarising control of stomach acid secretion at Gastric acid and Stomach, by Prisonblues

Polydactyly, by Drgnu23

Root canal, by Jeremykemp, traced by jellocube27

Antarctic krill eye at Compound eye, by Uwe Kils

Closeup of mushroom backlit by Sun at Gill (mushroom), by Eraticus

DNA clamp, by Opabinia regalis

Embryo by Ed Uthman

Strabismus surgery, by Bticho

Osmotic pressure on blood cells at Osmosis, by LadyofHats

Diagram of an eye, by Chabacano

Diagram of a neuron cell (at Dendrite, Chemical synapse, by LadyofHats

Front view of a female human skeleton, by LadyofHats.

Back view of a female human skeleton, by LadyofHats.

Citric acid cycle, by YassineMrabet/Narayanese and others

Autotomy, by Fir0002

Human respiratory system, by LadyofHats

Flagellum, by LadyofHats

Wormian bones, by LadyofHats

Human arm bones, by LadyofHats

Prokaryote, by LadyofHats

Herring Gull excreting waste from its cloaca, by Sanchezn

Staphylococcus aureus, by Erbe and Poole, ARS

Neutrophil engulfing anthrax bacterium, by Volker Brinkmann

Agar plate containing infected blood, by Bill Branson, edited by Fir0002

The Vitruvian Man, by Leonardo da Vinci (photographed by Luc Viatour)

Studies of Embryos by Leonardo da Vinci (photographed by Luc Viatour)