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.
E chinoderms are radially symmetrical animals that are only found in the sea (there are none on land or in fresh water). Echinoderms mean spiny skin in Greek.Many, but not all, echinoderms have spiny skin. There are over 6,000 species.Echinoderms usually have five appendages (arms or rays), but there are some exceptions. chinoderms are radially symmetrical animals that are only found in the sea (there are none on land or in fresh water). Echinoderms mean spiny skin in Greek.