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.
: any of a phylum (Echinodermata) of radially symmetrical coelomate marine animals including the starfishes, sea urchins, and related forms.â echiÂ·noÂ·derÂ·maÂ·tous \-ËkÄ«-nÉ-ËdÉr-mÉ-tÉs\ adjective. See echinoderm defined for kids. ADVERTISEMENT.efinition of ECHINODERM. : any of a phylum (Echinodermata) of radially symmetrical coelomate marine animals including the starfishes, sea urchins, and related forms. â echiÂ·noÂ·derÂ·maÂ·tous \-ËkÄ«-nÉ-ËdÉr-mÉ-tÉs\ adjective. See echinoderm defined for kids. ADVERTISEMENT.