Because thelogarithm<span> is the inverse function of the exponential operation, i.e.: if ab=c a , then b=</span>log<span>a(c) b = </span>log<span> a ( c ) .</span>
Yes an organ can belong to more than one system because the organ system is the digestive system.
Natural selection? Not sure if this helps but.. " A trait that gives the individual an advantage in survival or reproduction, given under a circumstance" sorry if im wrong ]: