Multiple choice Which of the following algae are used as sources of Br? Rhodomela Polysiphonia Vovox Ulothrix 1 and 2 1 and 3 2 and 3 2 and 4 3 and 4 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Br is obtained from red algae, like Rhodomela and Polysiphonia.