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The answer is 50%.
From the 'National Affairs' website, they conducted a study where they found that less than 20% of couples who married in 1950 ended up divorced, about 50% of couples who married in 1970 did.
And in regards to the basic unit of society question; the answer would be family. Family is the basic unit of society as it forms community and is the nucleus of civilisation.
Lymphocytes are amassed in the lymph hubs. The spleen and the thymus are additionally lymphoid organs of the resistant framework. The tonsils are lymphoid organs that are additionally connected with the stomach related framework. Lymphoid tissues contain lymphocytes, and furthermore, contain different sorts of cells for support. The confusion is legitimately coordinated with the lymphatic organ dependable is Spleen; failure to expel pathogens from lymph
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