Differences in male-female parenting styles are not imaginary or based on stereotypes, according to an extensive survey released Monday. Instead, differences are rooted in biology. From an evolutionary perspective, men and women share a strong interest in their offspring’s survival but pursue that goal in different ways, say the authors of “Mother Bodies, Father Bodies: How Parenthood Changes Us From the Inside Out.” “Evolutionary success is not based on whether you survive — rather, success is measured by whether you are able to produce offspring who survive, rep...