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Science Bowl Question

📅 NSB 2013🎓 HS🔄 Round 1#️⃣ Q19❓ TOSS-UP📝 Multiple Choice

Which of the following is NOT a characteristic of diatoms?

W) They have a saccharide cell covering
Y) They have a frustule [FRUHS-chool] made up of silica
X) They contain carotenoids [kuh-ROT-n-oids], as well as chlorophyll a and b
Z) Some species produce toxins
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