W is the point where blood filtration starts in a nephron which makes option A the most appropriate choice.
<h3>What is a Nephron?</h3>
This is defined as the microscopic structural and functional unit of the kidney.
The renal artery carries blood from your heart to your kidneys during which the process of blood filtration starts immediately.
Read more about Nephron here brainly.com/question/242658
Tissue culture is the growth in an artificial medium of cells derived from living tissue.
I'm not sure but it sounds like it could be a bagel?
