microbial organisms show diversity in digestive tract. colorful microscopic organisms interact in complex ways. close-up view

microbiome bacteria microorganisms digestive system guts microbiology intestinal flora microbial ecology health symbiosis diversity immune human body intestines microbiota colonization interaction symbiotic relationships commensalism immunity metabolism population balance tract skin composition model care science medicine illustration 3d biology microscopic color colorful variety density gut axis modulation ai research photo education