They have a very specific natural population of «good» bacteria (flora) critical to normal bowel function. (cedarbayouanimalclinic.com)
In her lab, she studies rodents to see how genetic variation is generated and maintained in natural populations. (sciencemag.org)
Throughout this latest study, the researchers controlled for natural population reduction factors, such as soil type, habitat and height of vegetation. (treehugger.com)