Kidney is very important organ in our body. It's not just have a good price in the market but have an essential role in our body for excretion and osmoregulation.
Every organism need their body to be free of waste (excretion) and maintain their osmolarity in the body (osmoregulation). And every organism have developed their own mechanism to throw out their waste such as,
1. Platyhelminthes:
They have special cells called flame cells for osmoregulation purpose.
2. Annelida:
They have nephridia for excretion and osmoregulation (such as in for eg. Earthworm).
3. Arthropods:
They have malpighian bodies for excretion and osmoregualtion.
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