Answer:it was very effective.
Explanation:
According to report in America 1954, Salk conducted a national study, with over a million paediatric subjects wish yielded a positive outcome and on 12 April 1955, the vaccine was considered safe and efficacious. in 1955, the vaccines was used for over 29,000 cases of poliomyelitis in the US and the infection rate reduced to less than 6,000. This made Salk vaccine more recognized and it was speedily adopted worldwide reaching almost 90 countries in less than 2 years after it mass production.
It would return to the right atrium. This is a result of the <span>vena cava, a large vein that runs deoxygenated blood cells from the lower body back to the heart.</span>
Answer :
Explanation : To find density, we can use the formula as given below;
density ρ =
Here, we have the mass as 89.6 g and the volume is ,
on calculating we get,
This means that the density of the copper sample is
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