The evolutionary development of reptiles depended primarily on them being able to discard the attachment to a watery or humid environment for survival and breeding perposes. Of the numerous features exibited by reptilia as a group, the most important in an evolutionary context are: | The evolutionary development of reptiles depended primarily on them being able to discard the attachment to a watery or humid environment for survival and breeding perposes. Of the numerous features exibited by reptilia as a group, the most important in an evolutionary context are: |