The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water.
C. Enzymes increase the rate of the chemical reactions carried out during metabolism.
Collenchyma and Parenchyma because they are cellulose containing cells.
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I'm gonna say D HOPE IT HELPSSSSSS
After my research the answer is that they are forms of electromagnetic radiation as far as I know.
