You've just learned how the kidneys filter blood in the microscopic units called nephron. Wastes such as urea form urine which travels from the kidneys to the urinary bladder by way of the ureters. From the bladder, urine travels through the urethra out of the body. Do other animals produce urine in the same way?
Choose any animal and research how that animal filters wastes out of its body. Do they have kidneys or another organ that does the same job?
