Question

In which animals, excretion takes place by diffusion?​

Answer 1

Answer:

Many unicellular organisms like Amoeba throw out their wastes by diffusion from their body surface. Protozoan's have no organs for excretion. As they live in an aquatic habitat, their wastes are eliminated by diffusion through the plasma membrane.

Answer 2

Answer:

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

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.

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