B is the correct answer i believe B is the correct answer i believe
I think A , please correct me if i’m wrong
Answer:
There is more than one kind of white blood cell
Explanation:
there is more than one type of white blood cells, for example Neutrophils normal percentage 40 to 60%, Lymphocytes 20 to 40%, and Monocytes 2 to 8%
The easiest would be the circulatory system. BUT, i would suggest the nervous system! It is so interesting, with so many sub-systems existing within it. It’s on the more complex side tho