Which of the following is not an echinoderm?

sea urchins

starfish

jellyfish

none of the above

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;