Adaptation of photoautotrophs to wavelength of light Illustration Play

Adaptations of insects that are essential for life on land Illustration Play

Adaptations of predators and prey Illustration Play

Adaptations of the eagle and a tropical tree Illustration Play

Adaptations of the rat Illustration Play

Adaptations to hot, dry habitats Illustration Play

Addition of phosphorus Illustration Play

Additional taxonomic ranks Illustration Play

ADH secretion and salt concentration Illustration Play

Adrenal gland Illustration Play

Adrenal gland Illustration Play

Advanced neoplasm Illustration Play

Aerobic bacteria Illustration Play

Afferent and efferent nerve fibres Illustration Play

Afferent nerve fibres Illustration Play

Age-related changes in bony tissue Illustration Play

Age-related changes in cartilaginous tissue Illustration Play

Age-related changes in joint cartilage Illustration Play

Age-related changes in the bone mass Illustration Play

Age-related changes in the skeleton Illustration Play

Agranulocytes Illustration Play

AIDS and tuberculosis Illustration Play

Air humidity Illustration Play

Air movement Illustration Play

Air pollution caused by a ship's engines Illustration Play

Air sac (alveolus) Illustration Play

Air temperature Illustration Play

Albumins Illustration Play

Alcohol and absorption Illustration Play

Alcoholic beverages Illustration Play