How do plant fossils help scientists understand past climates, They reveal past heat and moisture, Why are certain plant fossils useful for climate studies, Plants need specific survival conditions, Where are climate fossils often preserved in lakes, In layers at lake bottoms, How often do new sediment layers usually form, Each year, What can scientists compare in lake sediment layers, Differences in organisms over time, What can fossil layers show about climate change speed, Whether change was sudden or gradual, What type of fossils were found in Kansas, Sea animals related to squids, When did the Kansas sea animals become extinct, 65 million years ago, What remains were found in South Dakota, Giant sea turtle remains, How old were the South Dakota sea turtle fossils, About 70 million years old.

Environment and Evolution

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