Question

In lower animals , excretion occurs by __________ from the body surface

Answer 1

In lower animals excretion occurs by diffusion from the body surface.

- Excretion is one of the most important biological activities in a living organism by which the biological waste materials are removed from the body.

- There are many methods of excretion and in the lower animals which perform excretion by the external skin surface through a physical process known as the diffusion.

Answer 2

In lower animals, excretion occurs by diffusion from the body surface.  

Explanation:  

• Lower animals like Porifera conduct their excretion through the diffusion process.
• The ocscilum are present in the Porifera’s excretory opening, and these help in absorbing ammonia, carbon dioxide and water through the process of diffusion.
• When mineral particles get stuck in this process as they are too big to pass on through the opening, they are left behind in the water. The excretory system of the Porifera are dependent on a water flow system.

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