Blue- Footed Boobies Have Webbed Feet and Are Comically Clumsy

Blue- footed boobies have webbed feet and are comically clumsy when they walk on land.Evolutionary scientists view these feet as

A) the outcome of a tradeoff: webbed feet perform poorly on land,but are very helpful in diving for food.
B) a curiosity that has little to teach us regarding evolution.
C) an example of a trait that has not evolved.
D) an example of a trait that is poorly adapted.