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 this phylum includes sea stars brittle stars and basket stars sea lilies feather stars sand dollars sea urchins and sea cucumbers echiura echiurans are also called spoon worms they have a proboscis and small hooks on their posterior back end