What are natural scientists trying to do when they converting a statement like "It is unnatural for a same sex couple to raise a child" into a statement like this "Among species of mammals and birds where mated pairs engage in raising the young, there are no instances of male-male or female-female pairs raising young."?

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The Answer of What are natural scientists trying to do when they converting a statement like "It is unnatural for a same sex couple to raise a child" into a statement like this "Among species of mammals and birds where mated pairs engage in raising the young, there are no instances of male-male or female-female pairs raising young."?

What Are Natural Scientists Trying to Do When They Converting