All living things need to excrete, but what do we mean by this? Life processes - Living processes - Excretion Learning Points Excretion is the process of removing waste products. Waste products need to be removed from the body, otherwise they can build up and become harmful. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.