Answer:
Vaccinations
Explanation:
For example, if a disease has an R0 of 18, a person who has the disease will transmit it to an average of 18 other people. That replication will continue if no one has been vaccinated against the disease or is already immune to it in their community. So if you have (for example) a vaccination then you're less likely to get it, resulting in a lower R0
Answer:
The correct answer would be non-disjunction.
Down syndrome refers to the genetic disease caused by the non-disjunction of chromosome number 21.
Non-disjunction refers to the event in which the homologous chromosomes or sister chromatids fail to separate properly during a cell division.
In Down syndrome, the sister chromatids of chromosome 21 fail to separate properly which results in the formation of a gamete with 2 copies of chromosome 21.
When this gamete fertilizes with another gamete, it results in the formation of a zygote with 47 chromosomes, that is, 46 chromosomes + extra copy of chromosome 21.
Answer:
A. three of them would belong to blood group B
Explanation:
In a punnet square it would result in:
B b
B BB Bb
b Bb bb
C) His work proving that unseen bacteria can cause disease.
Answer: is 84.78 mm^2
Explanation:
we will first find out their areas, the area to be found is of a circle 
R^2
for the first one,
R=radius
pi=3.14
so,=3.14*(3mm*)^2
=28.26mm^2
for the second one
=3.14*(6mm*)^2
=113.04mm^2
their differences are equal to 113.04 - 28.26
=84.78 mm^2
