Answer:
Explanation:
As the inheritance is X-linked,recesson so for expression of muscular dystrophy in any given muscle,

enh1+ /enh1 + = Shows muscular dystrophy in heart (Homozygous for -)
enh2+/enh2+ = Shows no muscular dystrophy in arms (Homozygous for +)
enh3-/enh3+ = variabl or mosaic for muscular dystrophy in leg muscles (Hetrozygous for enh3)
One fourth means (one half) of (one half) .
So the 18 months must be two half-lifes.
The half-life of this particular isotope is 9 months.
She should conduct an expirement that proves whether the water changes the white flower or not
A. Skeletal and muscular
the other three don’t have to do with this type of internal movement though as the abdominal region and internal organs don’t have to do with this, A is the only possible answer