The answer for this question would be Integument, digestive, respiratory and urogenital.
The largest system that contact with the external environment would be integument and digestive. That makes two system has normal flora of microbes and not sterile like the other systems. Normal flora of microbes will prevent the pathogen microbe grows so it gives some benefit.
A.) The radius of vessel has the greatest affect on blood flow.(brainliest plz)
There numerous of them but some of them would be contaminated soil which can be followed with altered soil chemistry that contains fewer soil organisms that are essential. The third one would be surface runoff due to extensively modified hydrology of the area.
Water that is fit to drink is called?
<u>A- Potable </u>
B- Fluoridated
C- Non Bacterial
D- Saline
