Final answer:
Green algae fall into two major groups, chlorophytes and charophytes, and include both single-celled and multicellular organisms. Golden algae, or diatoms, are mostly unicellular and found in freshwater and marine environments. Brown algae, or Phaeophyta, are multicellular and primarily found in coastal waters with cool temperatures.
Step-by-step explanation:
Green Algae
Green algae fall into two major groups, the chlorophytes and the charophytes. Some green algae are single cells, such as Chlamydomonas and desmids, while others form colonies (e.g., Volvox) or long filaments of colonial cells (e.g., Spirogyra). Most members of the green algae genus Spirogyra live in freshwater, brackish water, seawater, or even in snow patches. A few green algae, like Chlamydomonas, can survive on soil that is covered by a thin film of moisture.
Golden Algae
Golden algae, also known as diatoms, are mostly unicellular, although some species can form large colonies. They are found in both freshwater and marine environments and are a major part of the plankton community.
Brown Algae
Brown algae, or Phaeophyta, are multicellular algae primarily found in coastal waters with cool temperatures. They have a complex three-dimensional structure and can form large seaweed-like structures.