We swing our arms while walking for $......$.

Long bones function as ........

Analogy type questions:
$(1)$ All locomotion : movement :: all movement : ...........
$(2)$ Cilia in trachea : help in removing dust particles :: Ciliated cells of female reproductive system : .........

Ureters act as urinogenital ducts in

Volkmann's canals are found in:

While at ease,some monkeys spend their time searching for something in each other's fur,which they then eat. What are they actually searching for?