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.
General Biology/Classification of Living Things/Eukaryotes/Animals/Phyla - Phylum Echinodermata. 1  Name means spiny skin. 2  This phylum consists of sea stars, brittle stars, sea urchins, and sea cucumbers. 3  Echinoderms are mostly sessile or very slow moving animals.