Because almost all small streams end up in bigger bodies of water.
1.- Description In science, a common, vulgar, vernacular, trivial, or popular name is any name by which a species or other concept is known, and which is not the scientific name.
2.-a principal taxonomic category that ranks above class and below kingdom
3.-biology, taxonomy) A scientific name at the rank of species, with two terms: the generic name (generic epithet, the genus of the species) and the specific name (a term used only in zoology, never in botany, for the second part of a binomial) or the specific epithet (the term always used in botany, which can also be used in zoology).
The universal genetic code known as DNA, found in all living organisms, is firm indication of a common design of all life. The actual number of first organisms is not known, making the prospect of common origin not only singular, as God, the creator of life, initially created the first life to bioform the Earth, changing the surface, the seas, and the atmosphere to prepare the environment for the progression of more complex life that would follow.
DNA is the most complex information system in the universe, firmly establishing the existence of God, the creator, as no naturalistic process could ever create life.