Sponges
From Wikiversity - Reading time: 3 min
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Sponges (Phylum: Porifera) are asymmetric, multi-celled animals. They are sessile and aquatic, and lack nervous, digestive or circulatory systems. [1] There is evidence in the literature to suggest that animals may have evolved a nervous system twice. [2] {{Animalia}}
References
[edit | edit source]Licensed under CC BY-SA 3.0 | Source: https://en.wikiversity.org/wiki/Sponges11 views | ↧ Download this article as ZWI file
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