Biology
Articles about living organisms, life processes and biological research.
Articles in this category: 1554
Updated: April 29, 2026
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Xenoturbella
Xenoturbella — simple marine deuterostome worms and their biology
Xerophile
Xerophile — organisms adapted to very dry conditions
Xylem
Y chromosome
Y chromosome: function, structure, evolution and significance
Yeast
Yersinia
Yersinia pestis
Yersinia pestis: the bacterium that causes plague
Zika virus
Zinc finger
Zooid
Zooid: modular individual unit in colonial animals
Zoology
Zoonosis
Zoonosis: diseases transmitted from animals to people
Zoospore
Zygnemataceae
Zygnemataceae: a family of filamentous and unicellular green algae
Zygnematales
Zygomatic bone
Zygomycota
Zygomycota (zygote fungi): biology, ecology, and taxonomy