Green algae are considered part of the plant kingdom because green algae contain the same cartenoids and chlorophyll a and b as plants that are on land.
Explanation:
Brown algae cannot be classified as part of plant kingdom because they have different accessory pigments and types of chlorophyll molecules in addition to chlorophyll a .
Green algae has chlorophyll a and b, xanthophylls while brown algae has chlorophyll a and c and fucoxanthin. It's also classified as kingdom protista because they are non plant photoautotrophs eukaryotes.
28 is correct. (NH4)2 is equal to 10 atoms. (8 H and 2 N ) CO3 is equal to 4 atoms. (1 C and 3 O) That's 14 atoms. But it's two molecules of this. So you just multiply by the number of molecules (2), and you get 28.
