This is a curious question. This question can be analyzed on different viewpoints. One type of analysis will be on the basis of biological criteria and the other will be on the basis of moral philosophical values. On the viewpoint of a biologist , humans belong to the kingdom Animalia under the five kingdom classification. The scientific name of human being is Homo sapien. The number of chromosomes present in a typical human being will be 46 including two sex hormones. Humans are again classified on the basis of sex. Males and females. Females have the unique ability to bear children. This was on the basis of biology. But on a philosophical viewpoint, humans become human by lending a helping hand, preserving the nature and by utilising his ability to think for the goodness of earth . A good human often help one another and would be compassionate to his fellow organisms.