Solution: 1 Arrange all 8 people first, and then divide by 8 (it doesn't matter who is there), and you get 8! /8=5040 species

2. First consider arranging 2 couples! =2 permutations, because men and women alternate, so the order of the other 4 pairs of men and women is the same as that of the first pair, and then 5 pairs are completely arranged and divided by 5 to get 2*5! /5=48 species