A human as the intermediate host Slideshow Play

A magnifying glass Student activity Play

A magnifying glass Whiteboard exercise Play

A refracting telescope Animation Play

A refracting telescope Student activity Play

A virtual image in a mirror Animation Play

Abundance of chemical elements in nature Student activity Play

Accommodation Animation Play

Accommodation of the eye Animation Play

Activities that affect the biological safety of humans Animation Play

Adaptations of humans to the environment Student activity Play

Adaptations of humans to the environment Whiteboard exercise Play

Adjusting sharpness Simulation Play

Adjusting sharpness Student activity Play

Adverse effects of aldehydes and ketones on the human organism Slideshow Play

Aerobic and anaerobic respiration in the human organism Student activity Play

Aerobic and anaerobic respiration in the human organism Whiteboard exercise Play

Aerobic respiration Student activity Play

Africa – the cradle of humankind? Student activity Play

Age-related changes in the human body Slideshow Play

Agglutinogens in the ABO system and blood groups Student activity Play

An eye Class activity Play

An eye Whiteboard presentation Play

An image formed by a magnifying glass Animation Play

An image in a mirror Student activity Play