Explanation:
Melanin is the pigment which absorbs UV light and it is present in skin and gives black colour to it.As we can see africans usually have black skin as they have to face direct uv light.
Normal:
Glucose
Rbc
NaCl
Amino acid
Plasma
Abnormal:
Albumin (protein)
Wbc
Remember that only small molecules can pass from the blood in the glomerular capillaries and this is cause they have thin walls
Because they have no competitors in any echological niche
Respiration is one of them