Because it is flexible. Think about it; the ribs protect both the lungs and the heart. If the ribs were solid bone all the way around then unless you constantly break your ribs you wouldn't be able to expand the cheat to breath. Additionally your lungs would constrict the heart to a degree that it would function properly.
The maintenance of equilibrium while stationary or moving is termed
A.) Balance
The answer would be abstinence because you’re abstaining from doing.... it
A fetus is considered viable as early as 24 weeks.
<h3>Age of viability of fetuses</h3>
A fetus is formed from a zygote.
A fetus is considered viable when it can survive and become a normal human irrespective of whether it gets to the required gestation period before being delivered.
This period has been found to be as early as the 24th week after fertilization.
More on fetuses can be found here: brainly.com/question/7964921
#SPJ11
