Natural Selection

Evolution typically happens...

• in a few weeks
• over millions of years
• never
• in 100 years

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Bird's beaks evolve mainly due to the type of ___________________ available.

• food
• water
• shrubs
• mates

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If an organism can't adapt fast enough, this might happen.

• hibernate
• stay the same
• live longer
• become extinct

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Darwin said that the number of offspring an organism has ___________________

• stays the same
• is more than can survive
• is less than needed

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Darwin said that within a species there will be _________________________

• nothing different
• variation/differences

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Organisms with differences/variations that are helpful will ______________________

• live longer
• become extinct
• show no change

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What can happen to a species over time if some of the organisms have an advantage?

• The population will decrease
• The population will become extinct
• The population will slowly increase

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Gradualism means Natural Selection would normally happen over many generations and very

• slowly

• quickly

• in space

• beyond time

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According to natural selection, light colored tree trunks would favor

• light colored moths

• dark colored moths

• red colored moths

• red and light colored moths

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Genetic diversity in a species makes long term survival of some members

• impossible

• improvable

• more likely

• less likely

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