Multiple choice Which of the following are used in long distance space travels? Chlorella Spirulina Synechococcus Chlamydomonas 1 and 2 1 and 3 1 and 4 2 and 3 3 and 4 Reveal answer Fill a bubble to check yourself B Correct answer Explanation This option is correct because algae like Chlorella and Synechococcus are used in long distance space travels.