I should premise that I use this term in a large and metaphorical sense, including dependence of one being on another, and including (which is more important) not only the life of the individual, but success in leaving progeny.
Lehenengo eta behin seinalatu behar dut esamolde hau adiera zabal eta metaforikoan erabiltzen dudala, hor izaki baten beste batekiko dependentzia barnesartuz, bai eta (garrantzitsuagoa dena) banakoaren bizia ezezik, ondorengoak izatean duen arrakasta ere.