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Directions: Read the passage, then answer all the questions below. Answer multiple-choice questions by circling the letter of the answer that you select. Write your answer to the “Read, Think, and Explain” question on the lines provided.
1. Which of the following is not a source of food?
A. Vertebrate marine organisms
B. Invertebrate marine organisms
C. Mineral salts
D. Marine algae
Answer: C
2. Which of the following compounds are extracted from red algae?
A. Carrageenans
B. Alginates
C. Beta carotene
D. Seaweed
Answer: A
3. Beta carotene is derived from which of the following algae?
A. Red algae
B. Green algae
C. Brown algae
D. Blue algae
Answer: B
4. Explain why the ocean is such a rich natural resource.
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