1. The red alga Chondrus crispus feels slick to the touch because its cell walls contain a thick layer of polysaccharide. The polysaccharide produced by brown algae is alginic acid, whereas that of C . crispus is 2. How many flagella does each Chlamydomonas individual possess? 3. Certain algae in the protist and plant clades are collectively referred to as seaweeds. Circle all of the organisms that qualify as "seaweeds". .