As spiritual leaders and scientists have often observed, the Hand of G-d can be seen as the record of nature and the natural world. What we learn from our study of one aspect of the natural world often applies to other, and sometimes, all, aspects.
All life partakes of very similar processes.
All creatures are born, all creatures die, and all creatures need food and a safe environment for themselves and their future generations. Even viruses are composed of many molecular components that must work together, just like the various functional bodies within single-celled organisms, and just like the many different organs in our bodies. When we look closely enough we find that we are all organisms composed of various internal components and we are all enmeshed in an interdependent external ecology as well. Everything was only HaShem, and, consequently, everything was subsumed within the exquisitely simple Oneness of G-d. But, HaShem did give part of His Will into our custody and the universe is diverse and life consists of organizations of different components.