Gymnosperms, or seed-breeding plants, were the only abundant form if plant life during the mesozoic era

YES !!!

Gymnosperms, or seed-bearing plants, were the only abundant form of plant life during the Mesozoic Era. Dinosaurs were the dominant land animal of the Mesozoic Era.

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for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .