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pink
The worm. You better see the full episode!
Spicules, like our skeleton, give the sponge structure. Without spicules, Sponge Bob would be Sponge Blob.
A larva is an immature form of a sponge looks very different from the adult sponge.
cannon
Invertabrates, are animals that lack a spine or spinal corde such as a worm, sponge or slug.
The spicule in a sponge is its skeleton. It provides strength in the sponge.
Sponge
There are 6 different types of sea sponges, the tube sponge, vase sponge, yellow sponge, bright red tree sponge, painted tunicate sponge, and the sea squirt sponge.
While salamanders and frogs do live in water, they don't only live in water. So your answer is a Sponge.
It would depend upon which steroids you used, and in what concentration. Steroids are used in humans to enhance muscle growth, but it would not have the same effect on a worm's muscles, which are quite different in structure.