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.
Fossils tell u if something has been there or not and u study it in some classes or jobs
B. Nucleus (because the nucleus is to the organelles, like the brain to our organs).
The study of energy and its changing
form is called thermodynamics. Thermodynamics is the branch of physical science
that is concerned with conversions between heat and other forms of energy such
as chemical, electrical or mechanical energy. Under thermodynamics, energy can
be transferred from one place to another and from one form to another.
b. insertion
<span>
</span><span>The Klinefelter syndrome is caused by an insertion mutation. It occurs
when there is an existence of an excess or extra X chromosome in each cell that
may cause an abnormality in the development of males. It usually affects the
physical and cognitive development of male with symptoms varying from one
person to another. Kids with these type
of disorder may experience learning
disabilities and even speech and language
problems. These kids tend to be
quiet and very sensitive. They can also be very passive.
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