Question

fill in the blank question
in blood fractionation, white blood cells and platelets settle into a narrow zone called the □ coat.

Explanation:

In blood fractionation, after centrifuging blood, the components separate into layers. The plasma is on top, then a narrow zone with white blood cells (leukocytes) and platelets (thrombocytes) called the buffy coat, and then red blood cells at the bottom. This is a concept in Biology (a subfield of Natural Science) related to blood composition and separation.

Answer:

buffy