Answer:
The correct answer is option - C amino acids.
Explanation:
The blood brain barrier or BBB is border that separates extracellular fluid in the central nervous system (CNS) and the blood that is circulating from the brain.
This barrier is allows the passage by facilitate diffusion (passive diffusion) and through the selective proteins of molecules such as glucose, amino acids that are essential for the neural function.
Thus, the correct answer is - amino acids.
A seals flippers has finger bones when a birds wing is just a bone connected to other joints.
B-Kidneys
The kidneys act as filters that strain urea and excess salts from the bloodstream to release them in the urine.
