Answer:
Check the explanation
Explanation:
Average weight before selection =2.5 kg
Average weight after selection = 5.5 kg
Average weight in the next generation =3.5kg
= 
R= Mean weight in the next generation - mean weight before selection
= 3.5-2.5 = 1.0
S= Mean weight after selection -mean weight before selection
= 5.5 - 2.5 = 3.0
=
=
= 0.33
A because it goes to the lungs first
Viruses are the only thing considered to be a living thing without cells, as they attach themselves to cells to multiply.