How excretion occur in shelled eggs?

 

 How excretion occur in shelled eggs?

Excretory products are stored within the shell in special packings.e.gBirds ( egg laying) excrete their nitrogenous wastes as uric acid in the form of a paste.This process is metabolically more expensive but it allows more efficient water retention, therefore embryos store uric acid more easily in the egg.

The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues).

This sac-like structure is primarily involved in nutrition and excretion, and is webbed with blood vessels for gaseous exchange.

 

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