The most appropriate would be D or A. I don't see how wearing different shoes would help the clients knees.
A possible answer could be the quality of air being inhaled
Answer:
The correct answer is - Ivan Pavlov.
Explanation:
Ivan Pavlov is the first philosopher to study the learning or the behavior of the organisms. Ivan Pavlov was a Russian physiologist. He helped in developing the discipline of psychological.
Ivan Pavlov known for the classical condition that was explained in his major textbook. This discovery is shown in dogs during his studies as he pointed out that animals salivated naturally upon the sense or even smell of food.
Thus, the correct answer is - Ivan Pavlov.
I believe its for nutrition.
They are attacked by lymphocytes.
