What is the difference between saving an Excel file in .xlsx and in .csv? Would it be better to import into R using .xlsx or .csv?
The phylum Echinodermata, which contains about 6000 species, gets its name from the Greek, literally meaning âspiny skin.â This phylum exists exclusively in the sea and includes sea stars, urchins, brittle stars, and sea cucumbers. They are simple animals, lacking a brain and complex sensing organs.
Echinodermata is the largest phylum that does not have any of its organisms living on land or in fresh water. The most common Echinoderms are starfish, sea cucumbers, sea urchins, and sand dollars. The name literally means, in Greek, spiny skinned, because that's what echinoderms look like.