Questions 1) The trait of webbed feet in ducks: a) originally appeared in ducks or their ancestors because they lived in water and needed webbed feet to swim.
(The trait of webbed feet in ducks; appeared; L:in ducks or their ancestors; because they lived in water and needed webbed feet; T:originally) (they; lived; L:in water) (they; needed; webbed feet; to swim) Context(they needed,List([107, 137))):(they; needed webbed feet to swim; )
they needed,List([107, 137))
The trait of webbed feet in ducks they they they
appeared lived needed needed webbed feet to swim
L:in ducks or their ancestors because they lived in water and needed webbed feet T:originally
L:in water
webbed feet to swim