No, as in most (if not all) sponges, barrel sponges are completely sessile and unable to move locations.
barrel sponges are stupid!
Yes just a different shape
The scientific or taxonomic name would be Xestospongia spp.
they filter feed
The Porifera are the sea sponges. Some simple examples are the kitchen or bath sponges or other sponges that one can see diving -- from barrel to branch sponges.
real sponges
No, kitchen sponges nowadays are usually made from cellulose or synthetic plastics. Real marine sponges were used by early Europeans to also clean, but it was stopped due to overfishing that almost brought the sponges to extinction.
porifera is the phylum for sponges
In Cartoons, Yes. In Real Live, No.
The barrel sponge can reproduce it reproduces asexually it buds off and then where ever it lands it sticks there grows roots and does it all over again
The Sleeve is the tube that covers the REAL barrel on the rifle. It protects the barrel from damage. It's nothing more than a hollow tube surrounding the real barrel inside.