Which of the following character is common for all three classes chlorophyceae, phaeophyceae and rhodophyceae of algae?

All of the three classes ( Chlorophyceae, Phaeophyceae and Rhodophyceae) have the presence of chlorophyll a and have cellulose present in the cell wall. Mannitol is the reserve food material in brown algae, floridean starch is the reserve food material for red algae and flagella are locomotory structures in green and brown algae but are absent in red algae. Presence of polysulphate esters in the cell wall is the characteristic feature of red algae.