If Flight Is Such an Advantage,how Do We Account for the Evolution

question 26

Multiple Choice

If flight is such an advantage,how do we account for the evolution of flightless birds?

• A) They were primitive ancestors of the winged birds
• B) Flight is costly in terms of energy so birds abandon flight if they live in areas with food and without substantial predators, such as islands
• C) This is always an inferior situation if they can't fly, so wingless birds occur only where winged birds are missing
• D) Birds give up flight if they can avoid having to lay eggs
• E) None of the choices are correct

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