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Micturition (peeing) starts with urine flowing from the kidneys to the bladder via ureters. The bladder expands using transitional epithelium. Urine exits through the urethra, controlled by internal and external urethral sphincters. Ureters prevent backflow, thereby reducing infection risk

Overview of photosythesis

In this video you will learn how to use the Pythagoras theorem.

Introduction to evolution, variation in a population and natural selection