A Few Birds,such as Ostriches,have Wings but Cannot Fly

question 11

Multiple Choice

A few birds,such as ostriches,have wings but cannot fly.Which of the following best explains this?

• A) Ostriches are not true birds.
• B) Ostriches evolved from an amphibian ancestor that had winglike arms and glided among trees.
• C) When reptiles evolved into birds,some birds developed wings for flight,but others developed wings incapable of flight.
• D) Ostriches evolved from a bird ancestor that flew.
• E) Ostriches evolved first,then all other flying birds evolved from ostriches.

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