17. Which group of invertebrates is divided into segments with a ringed appearance? A. sponges C. cnidarians B. echinoderms D. annelids 18. Animals such as vertebrates and invertebrates have economic importance. They are sources of food, medicine and scientific investigations. How will you show that you care and protect these animals in their environment? A. We don't need to strictly implement wildlife regulations. B. We must have them lived in our houses. C. We have to establish reserve wildlife refuge areas where birds and animals may breed without being killed by man. D. Hunting activities must be practiced.

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