arteries, arterioles, capillary beds, venules, veins
I'm not sure if this is correct, but I believe it would be that plants need carbon dioxide (plants are living) plants need carbon dioxide to produce oxygen for humans to breathe in, not totally sure if this is correct like I said but I hope I kind of helped. :)
Seems legit you know more about this than me obviously
The human microbiota is the aggregate of microorganisms thatresides on or within any of a number of human tissues and biofluids including the skin mammary glands placenta seminal fluid uterus ovarian follicles lung saliva oral mucosa conjunctiva and gastrointestinal tracts.