Here's why:
* Function: Both green glands and kidneys are responsible for filtering waste products from the blood and excreting them from the body.
* Mechanism: While the exact mechanisms differ, both organs use filtration and reabsorption to remove waste and maintain fluid balance.
However, it's important to remember that green glands and kidneys are not homologous. This means they don't share a common evolutionary origin. They evolved independently to perform the same function, a phenomenon called convergent evolution.