On the return stroke , the webbing on the foot of the duck closes up which allows the duck to have less water resistance and to travel faster .
(the webbing on the foot of the duck; closes up; L:On the return stroke) (the webbing on the foot of the duck; allows; the duck to have less water resistance and to travel faster) Context(the webbing on the foot of the duck allows,List([23, 81))):(the duck; to have; less water resistance)
the webbing on the foot of the duck allows,List([23, 81))
the webbing on the foot of the duck the webbing on the foot of the duck the duck
closes up allows to have
L:On the return stroke
the duck to have less water resistance and to travel faster
less water resistance