They are homologous because they have similar structure regardless of purpose
The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water.
Answer: It is the universal solvent.
Explanation:
Because water is the universal solvent.
