 This interplay has recently involved philosophers and biologists attending more squarely to the microbial world (O’Malley, Simpson, &amp; Roger 2013; O’Malley 2014), recognizing the various tight integrative and collaborative relations between what prima facie are distinct biological individuals (Dupré &amp; O’Malley 2009, Ereshefsky &amp; Pedroso 2015), and trying to make sense of the diversity one finds in the processes of reproduction, metabolism, and development (Godfrey-Smith 2016b, Griesemer 2016). The next section provides an introductory survey of this interplay via discussion of three subsidiary questions.