The amount of blood in an adult human is relatively constant: Around 4.7 litres, with of total weight of ~4.4 Kg (average density of blood: ~1.06). Perhaps slightly more (~5 litres?). And slightly less in women. So the percentage of total body weight varies, depending of total body weight. More information and details here: Volume of Blood in a Human
Social issue. A social issue is a problem that influences a considerable number of the individuals within a society. It is often the consequence of factors extending beyond an individual's social issue is the source of a conflicting opinion on the grounds of what is perceived as a morally just personal life or societal order. Social issues are distinguished from economic issues; however, some issues have both social and economic aspects. There are also issues that don't fall into either category, such as warf
Despite Social Security, older women remain at greater risk of poverty than older men. 1  Among people 65 and older, more than twice as many women (nearly 2.9 million) as men (over 1.3 million) lived in poverty in 2013. 2  The poverty rate for women 65 and older was 12 percent, compared to 7 percent for men 65 and older.