Where are the non-nucleated blood cells produced?

Which of the following components, if introduced into the bloodstream, will cause blood clotting at the site of introduction?

One of the factors required for the maturation of erythrocytes is . . . . . . .

$A$ man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. Which one of the blood groups readily available in the hospital will be safe for transfusion?

Which pigment is responsible for the color of plasma?

Deficiency of vitamin $K$ may lead to