The brown algae, commonly large seaweeds found in temperate coastal waters, belong to which division?

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Prepare for the IB Marine Science SL Exam. Study with flashcards and multiple choice questions that include hints and explanations. Ace your exam!

Multiple Choice

The brown algae, commonly large seaweeds found in temperate coastal waters, belong to which division?

Explanation:
Brown algae are classified in Phaeophyta. Their distinctive brown color comes from fucoxanthin in their plastids, which masks the green of chlorophyll and helps them thrive as large, multicellular seaweeds in temperate coastal waters. This combination of pigment, multicellularity, and temperate-habitat features sets them apart from the green algae (Chlorophyta), red algae (Rhodophyta), and mainly unicellular dinoflagellates (Dinoflagellata).

Brown algae are classified in Phaeophyta. Their distinctive brown color comes from fucoxanthin in their plastids, which masks the green of chlorophyll and helps them thrive as large, multicellular seaweeds in temperate coastal waters. This combination of pigment, multicellularity, and temperate-habitat features sets them apart from the green algae (Chlorophyta), red algae (Rhodophyta), and mainly unicellular dinoflagellates (Dinoflagellata).

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