Of all the protistians, green algae are the most like plants in terms of their biochemistry and structure. Some evolutionists believe green algae were the group from which plants evolved.
* Like plants, green algae i) Possess chlorophylls a and b
ii) Possess cell walls composed of cellulose, pectins, and other polysaccharides
iii) Store carbohydrates as starch in their chloroplasts (with nuclear membrane)