Cholera – an acute intestinal disease Slideshow Play

Cholera – an ever-present threat Student activity Play

Cholera – an ever-present threat Whiteboard exercise Play

Cholera epidemics in the nineteenth-century Illustration Play

Choosing shoes Whiteboard exercise Play

Choosing the best offer Student activity Play

Choosing the best offer Whiteboard exercise Play

Choosing the right optical instrument Whiteboard exercise Play

Chord bisector goes through the centre Student activity Play

Chord bisector goes through the centre Animation Play

Chords and diameters Student activity Play

Chords and diameters Simulation Play

Chromium Animation Play

Chromoplasts – "aged" chloroplasts Slideshow Play

Chromosomal aberrations Animation Play

Chromosomes and gametes Whiteboard exercise Play

Chytridiomycota Illustration Play

Circle and line in a coordinate system Student activity Play

Circle and line in a coordinate system Simulation Play

Circle circumscribed about a quadrilateral Animation Play

Circle circumscribed about a quadrilateral Animation Play

Circle circumscribed about a triangle Animation Play

Circle circumscribed about a triangle Animation Play

Circle in the Cartesian coordinate system Whiteboard exercise Play

Circle inscribed into a parallelogram Simulation Play

Circle inscribed into a quadrilateral Student activity Play

Circle inscribed into a quadrilateral Simulation Play

Circle inscribed into a square Simulation Play

Circle inscribed into a triangle Student activity Play

Circle inscribed into a triangle Simulation Play