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

Question

1.Warm-wet (Congo)

2.Warm-dry (Sahara)

3.Cold-dry (Mongolia)

4.Cold-wet (Canada)

Answer 1

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:?

Answer 2

it's equally hard everywhere you go..

different animals are adapted for different places