The first plants to produce seeds appeared in the _______ period.
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Q229: Which statement about Earth's lithospheric crust is
Q230: The geological process of subduction (characterized by
Q231: Which of the following gases have opposing
Q232: A fossil of a marine crab, suspected
Q233: Over geologic time, the concentration of O2
Q235: During the _ period of the _
Q236: For terrestrial animals and plants, the most
Q237: Which of the following is not considered
Q238: The elimination of many forms of life
Q239: Much of the _ we now use
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