Endocrinology. That would be the correct answer. {:)
Answer:
Physical
Explanation:
The skin is a physical barrier.
Mechanical barriers are made by mucous membranes
Answer:
False
Explanation:
Consider if there was oil everywhere then every country wouldnt have to fight for oil or go out to sea and begin drilling its simply not distrubuted evenly
<span>The length of a vertebrate's D. Nephrons determine its ability to concentrate urine. Nephrons are the functional units of the kidney that produce urine. </span>