Which of the next conditions is harder for animals to live in

Which of the next conditions is harder for animals to live in?
1.Warm-wet (Congo) 2.Warm-dry (Sahara) 3.Cold-dry (Mongolia) 4.Cold-wet (Canada)
Zoology - 2 Answers
Random Answers, Critics, Comments, Opinions :
1 :
it's equally hard everywhere you go.. different animals are adapted for different places
2 :
All of them are hard to different types of animals but I know the easiest is Warm-wet because it is humid and a lot of animals live there . I think:?

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