I'd draw a car on a hill and explain how you press the gas pedal and gravity helps push the car down the hill, or draw it going up the hill and explain how gravity makes it difficult for the car to make it up the hill.
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.
B. Ocetoclast is the answer.
The answer should be the first quarter moon