Which of the following is NOT a characteristic of diatoms?

W) They have a saccharide cell covering

Y) They have a frustule [FRUHS-chooI] made up of silica

X) They contain carotenoids [kuh-ROT-n-oids], as well as chlorophyll a and b

Z) Some species produce toxins
W) THEY HAVE A SACCHARIDE CELL COVERING