I also have a problem with the whole idea of 'race' as there is no essential biological difference between any human beings.

Probab y one of those biological differences between men and women.

The reader wasn't buying the idea of a biological difference linked to race.

There is no ready explanation, but the trend may be rooted in biological differences.

The great thing about us humans is our ability to transcend biological differences, particularly if we understand them.

Still, this difference could be a result of historical circumstances rather than biological differences.

And I'm not talking about just the obvious biological differences.

Of course, we cannot forget the natural biological differences which exist between men and women.

It is responsible for determining the biological differences between the sexes - men have 8 to 10 times more than women do.

Gender Men and women have obvious biological differences, but they're not a factor when it comes to weight.