What features of the process of reproduction of gymnosperms and reptiles allow us to judge the climatic conditions of the Mesozoic era?

The appearance of the seed gave the gymnosperms great advantages, since it freed the sexual process from the need for water for fertilization (the climate at the end of the Mesozoic era became drier, but remained warm).
Reptiles acquired properties that allowed them to finally break with the aquatic environment. Internal fertilization and the accumulation of yolk in the egg made reproduction possible on land.

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