Refracting telescope Student activity Play

Refraction diagrams Student activity Play

Refraction of light Student activity Play

Refraction of light Student activity Play

Refraction of plane waves Student activity Play

Refrigerator Student activity Play

Regions on the plane and inequalities Student activity Play

Regions on the plane and inequalities Student activity Play

Regular and irregular polygons Student activity Play

Regular polygons – the dodecagon Student activity Play

Regular polygons – the equilateral triangle Student activity Play

Regular polygons – the octagon Student activity Play

Regular polygons – the square Student activity Play

Regular shapes Student activity Play

Regular tetrahedrons Student activity Play

Regulation of blood calcium concentration Student activity Play

Regulation of blood pH – the role of the kidneys Student activity Play

Regulation of body temperature Student activity Play

Regulation of carbon dioxide concentration by plants Student activity Play

Regulation of gene expression in eukaryotes Student activity Play

Regulation of gene expression in prokaryotes – operons Student activity Play

Regulation of reproduction in farm animals Student activity Play

Regulation of salt balance – the role of aldosterone Student activity Play

Regulation of the amount of light entering the eye Student activity Play

Regulation of the synthesis of enzymatic proteins Student activity Play

Regulation of water balance – the role of antidiuretic hormone Student activity Play

Relationship between air resistance and speed Student activity Play

Relationship between division and multiplication Student activity Play

Relationship between electromagnetic force and the position of the conductor Student activity Play

Relationship between Kp and Kc Student activity Play