Jonathan Bird's Blue World: Sponges!
There's something completely fascinating in
something so incredibly simple. Sponges—animals that can't walk or swim—are
incredibly efficient at what they do and have a super fun history to them too.
Watch Jonathan Bird explain how sponges work and where they come from in this
Blue World clip.
To illustrate how sponges work in filtering
water, the neon dye was added at the base of the sponge. The sponge sucks in
that water almost immediately with a sweet smoking effect.
Sponges are animals of the phylum Porifera
(/pɒˈrɪfərə/; meaning "pore bearer"). They are multicellular
organisms that have bodies full of pores and channels allowing water to
circulate through them, consisting of jelly-like mesohyl sandwiched between two
thin layers of cells. Sponges have unspecialized cells that can transform into
other types and that often migrate between the main cell layers and the mesohyl
in the process. Sponges do not have nervous, digestive or circulatory systems.
Instead, most rely on maintaining a constant water flow through their bodies to
obtain food and oxygen and to remove wastes. (From Wikipedia)
Display of natural sponges for sale on
Kalymnos in Greece
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