What living conditions on the ancient planet could, in your opinion, ensure the existence of such representatives of the kingdom

What living conditions on the ancient planet could, in your opinion, ensure the existence of such representatives of the kingdom of plants as horsetails, lymphoids and ferns, as well as representatives of the kingdom of Animals – amphibians?

The warm and humid climate contributed to the prosperity of horsetails, lyre, ferns and amphibians. Reproduction of the listed plants depends on the availability of water. Amphibians are cold-blooded animals, and as the temperature drops, the conditions for their existence become more and more uncomfortable.

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