Some, such as octopii, possess a brain, but most mollusks just have concentrations of nerve cells in their body that serve as primitive brains, called ganglia (singular ganglion).
To add to the previous answerer, Cephalopods (squids, chambered nautilus, octopi, cuttlefish) have a brain.
Barnacles are crustaceans( a type of arthropods)
commensalism
Yes, "as rough as the barnacles" is a simile. It compares the roughness of something to the rough texture of barnacles using the word "as."
There are more than 1,000 different species of barnacles.
Barnacles protect themselves by sticking to something sturdy.
Barnacles live only in salt water.
Barnacles are shellfish that cling to rocks or ships hulls.
An example of commensalism is the relationship between barnacles and whales. Barnacles attach themselves to the skin of whales and benefit by getting a free ride through the water and access to nutrients. The whales are not significantly affected by the presence of the barnacles.
The things that eat acorn barnacles are whelks which arte sea snails, mussels and some starfish all eat of feed on barnacles
You can remove dried barnacles from a fiberglass boat using a stainless steel scrubber or a pressure washer for large barnacles.
Barnacles belong to the phylum Arthropoda and the order Sessilia.
Barnacles can attach themselves to various watercraft including kayaks.