Antibodies are produced by

In case of disputed parentage,the blood group analysis of the mother,child,and alleged father can:

To prevent blood clotting, donor blood is treated with $..........$.

What are blood platelets a source of?

If a mother possesses only '$B$' antibodies (implying blood group '$A$') and the father has blood group '$O$',what will be the possible blood group$(s)$ of the child?

Blood does not clot inside the blood vessels due to the presence of