Write a function header for the ZooAnimal class member function daysSinceLastWeighed. This function has a single integer parameter today and returns an integer number of days since the animal was last weighed. void ZooAnimal::Destroy () { delete [] name; } // member function to return the animal's name char* ZooAnimal::reptName () { return name; } // member function to return the number of days // since the animal was last weighed { int startday, thisday; thisday