The answer is Surgical Contraceptive Methods e.g. Vasectomy(For males) and Tubectomy(Females)<span>.
</span>Vasectomy:- In this method vas deference is cutted and tied so that sperms can't reach uthera.
Tubectomy:- In this method both fallopian tubes are cut and tied, so that no egg can head towards the site of reproduction(
Cervix).
Note:- Both process are irreversible.
Liquid 1 and 4, because they have the same melting point and density.
Radioimmunoassay (RIA) is a test that combines radioactive chemicals and antibodies to detect minute quantities of substances in a patient's blood.
In 1959, biophysicist Rosalyn Yalow and physician Solomon A. Berson developed a sensitive method for measuring very small amounts of a substance in the blood called radioimmunoassay (RIA).
Radioimmunoassay (RIA) is a technique that make use of radioisotopes, usually iodine-125, as a tag or label for the detection of antigen. This technique determines the concentration of an antigen based on the competitive binding between radiolabeled and unlabeled antigen for its specific high affinity antibody.
It is very sensitive that it can measure concentrations up to 0.001 μg/ml.
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