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This question already has an answer here:

So i'll start by saying it feels like a somewhat stupid question in the sense that the answer is no, but im wondering if (for back story of races in a story) its realistically possible for a planet to just be majority or entirely one type of biome, i.e. desert, rain forest, wooded, snowy. it feels like no to me mainly because you end up with different climates due to the curvature of a planet and the distribution of warmth from a star. maybe the desert planet is constantly day time due to having multiple stars in its system, snowy i think is easy to justify, but rain-forest not sure honestly. So please do tear this thinking apart :)

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This question asks for hard science. All answers to this question should be backed up by equations, empirical evidence, scientific papers, other citations, etc. Answers that do not satisfy this requirement might be removed. See the tag description for more information.

marked as duplicate by Dubukay, Alex2006, JBH, Community Jan 1 at 0:11

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ This Meta discussion is probably also relevant for close-voters $\endgroup$ – Dubukay Dec 31 '18 at 22:32
  • $\begingroup$ I don't think the hard-science tag is practical here. We have exactly one example of a planet with life to go on (Earth). We don't have equations for life, much less for biodiversity. We can barely climate model with simulations outside of Earth and Earth climate models are very, very specialized. I don't see a way to produce useful hard science answers. $\endgroup$ – StephenG Dec 31 '18 at 22:51
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Only one biome, no -- you need seas, or else there is no water cycle.

But markedly less climatic and biologic diversity than what we have now is indeed possible. Imagine Earth in the Cretaceous -- "a very gentle temperature gradient from the equator to the poles meant weaker global winds, which drive the ocean currents, resulted in less upwelling and more stagnant oceans than today" (Wikipedia). Temperate climate extended almost to the poles. If you don't have large continents there will be no deserts. So, minimum, sea, tropical, temperate.

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