FOWChallenge-Sponge

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sponge

a primitive sedentary aquatic invertebrate
with a soft porous body that is typically supported
by a framework of fibres or calcareous or glassy spicules.
Sponges draw in a current of water to extract
nutrients and oxygen.
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After seeing some Google photos of sea sponges…

…I’m beginning to wonder if

the semi-circular(ish) object (top centre)

maybe a sponge and not coral

as previously thought.

Great Barrier Reef

Cairns

Far North Queensland