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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Reserve Requirement

A regulation set by central banks that determines the minimum amount of reserves that must be held by a commercial bank.

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In banking, deposits refer to funds placed into an account which can be withdrawn by the account holder, often used for saving or transactional purposes.

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The official currency issued by the Federal Reserve System, constituting the primary form of paper money in the United States.

Federal Reserve System

The chief banking authority in the United States, tasked with the formulation of monetary policy and the oversight of banking institutions.