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Q: What are diatoms?
A: Silica-shelled algae (Jurassic–Holocene), photosynthetic, with centric or pennate frustules; major food source; form diatomaceous oozes
Q: What are coccolithophores?
A: Marine algae (Triassic–Holocene), produce calcite disks (coccoliths), photic zone, warm-water restricted (45°N–45°S). Major food source, suffered Cretaceous extinction but radiated in Paleocene
Q: What are silicoflagellates?
A: Marine flagellates (Late Cretaceous–Holocene), silica lattice skeletons, temperature-sensitive, used as paleo-temperature indicators
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