Here are the answers to question 5: a) What is excretion? Excretion is the process by which living organisms eliminate metabolic waste products and other non-useful substances from their bodies. b) State two excretory products in plants. • Oxygen • Water vapor c) State two excretory products in animals. • Urea • Carbon dioxide d) Name two excretory organs in mammals. • Kidneys • Lungs e) State two ways in which the kidney is adapted to its function. • The kidney contains millions of nephrons, which are the functional units responsible for filtering blood and forming urine. • It has a rich blood supply via the renal artery, ensuring efficient filtration of blood. That's 2 down. 3 left today — send the next one.