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Professor Brian Cox explains how the Earth developed an oxygen rich atmosphere due to organisms called Cyanobacteria.

Professor Brian Cox explains the first law of thermodynamics. He describes how energy is always conserved, never created or destroyed.

Professor Brian Cox explores how life on Earth is so varied, despite us all being descended from one organism, known as LUCA. He examines how cosmic rays drive the mutations that create evolution.

Professor Brian Cox visits Madagascar to track down the rare aye-aye lemur, and see how it is perfectly adapted to suit its surroundings.

Professor Brian Cox sees photosynthesis in action, investigating a unique type of jellyfish that have evolved to carry algae within their bodies and feed off the glucose the plants create.

Professor Brian Cox describes the similarities between isotopes of water on comets and our planet and suggests that the water in the oceans may have come from asteroids.

Professor Brian Cox explains that in hydrothermal vents on the ocean floor, energy is released in the presence of organic molecules.

Professor Brian Cox explains the evolution of the mammalian ear bones, the malleus, incus and stapes by using a flicker-book to show how the gill arches of jawless fish altered in size and function.

Professor Brian Cox shows the stages of the evolution of the eye, from a primitive light sensitive spot, to a complex mammalian eye.

Professor Brian Cox compares the way that protists sense and react to their environment with the action potentials found in the nerves of more complex life.

An explanation of how forces including gravity affect organisms. Professor Brian Cox explains that as size doubles, mass increases by a factor of eight.

Professor Brian Cox explores the relationship between an organism's body size and its metabolic rate.

This series aimed at 7-14 year-olds introduces key concepts in biology, focusing on the seven important lessons from the natural world with beautiful wildlife footage.

Use these Bitesize resources to set homework, independent study tasks or to consolidate learning for your pupils.

The latest news stories from Newsround to share in the classroom.