In the nature-nurture debate, it is true that nature refers to the influence of the environment.
<span>Weight
gain occurs either through intentional or unintentional way. Intentional way of
weight gain is where an individual is over eating or having meals that have
high calories which makes a person obese. The unintentional way of weight gain
is when an individual is experiencing medical problems like urinary problems,
endocrine system problems like hormonal imbalances and the likes, due to
stress, etc. An individual who are having a weight gain problem should consult
a doctor immediately to check the cause of the weight gain and to solve the
problem. </span>
Your circulatory and respiratory systems
Its not D or A because not much flexibility is needed for those. So I believe its C if not its B im going with C (:
