THE human genome must contain instructions that make building personal music collections a primal biological need.
Our gendered hierarchy is based on an innate biological need for women to be supported by men.
It's long been recognized that humans have a biological need to connect with nature.
For languages, the explanation may be a cultural rather than biological need to distinguish populations.
But we must take seriously our biological need to be challenged, or face the danger of evolving into creatures whose lives are more productive but also less satisfying.
It's also possible that women have a biological need to try to improve upon all that they hold dear -- their children, their husbands, their homes.
This suggests that the mammary gland can adapt to different molecular functions according to the biological need of the animal.
Birds, on the other hand, do not seem to have a biological need for passing gas, but they could let one rip, theoretically.
For solitary male dolphins isolated from their society, rubbing themselves on objects or people has been observed as attempts to meet that biological need, she said.
Female bodies, inspired almost certainly "by a biological need to maintain energy stores for reproduction," Braun says, fight hard to hold on to every ounce of fat.
