How can green algae be both multicellular and unicellular? What are the cases in which it can be both uni and multi cellular?

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    $\begingroup$ "Green algae "is a broad group. You should add details to your question. And why the "organic-chemistry" tag? $\endgroup$ – WYSIWYG Apr 27 '15 at 9:35

Because Algae are represented across four kingdoms, namely Bacteria (unicellular prokaryotes), Plantae (multicellular eukaryotes), Chromista (multicellular eukaryotes), and Protozoa (single-celled eukaryotes).

For example, I. Chlorophyta is unicellular:

I. Chlorophyta. Source: University of Wisconsin

While kelp can become huge and can form underwater forests:

Kelp. Source: Nature

Guiry, J Phycol 2012; 48, 1057–63

  • $\begingroup$ -1. The taxonomic classification (the four kingdoms mentioned) utilized here and the corresponding habituses are at best inaccurate or incomplete. Moreover the question was about green algae (Chlorophyta), I don't see how this answer addresses it. $\endgroup$ – har-wradim Oct 26 '16 at 10:28

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