Evolution

Woolly mammoths became extinct when the ice age ended. What might have been one reason?

• They evolved into elephants instead
• They were more adapted to the new warmer climate
• They were less adapted to the new warmer climate
• They were hunted by early humans

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Why might giraffes developed their long necks?

• Longer necks meant more food could be eaten, helping survival and reproduction
• To keep their heads/brains further from predators
• Longer necks matched their longer legs
• Males needed them to fight each other for females

What is natural selection?

• Only the organisms most adapted to their environments survive to reproduce
• Humans choosing which traits are desirable and breeding for them
• Organisms mate with another species that is best adapted for its environment
• Survival through mutation

Within a species of fish, some individuals have larger fins than others.  This is called

• mutation.
• random chance.
• selective breeding.
• variation.

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Why is DNA critical to all species?

• It links all organisms to a common ancestor
• It means that any species can breed with any other
• It carries the genes that determine inherited traits
• Not all species have DNA

What do we call a trait that helps a species survive and reproduce?

• adaptation
• gene
• natural selection
• selective breeding

What do we call a change in an organism's DNA?

• Variation
• Mutation
• Selection
• Homologous

Approximately how old is the Earth?

• 4.6 billion years
• 2.5 billion years
• 500 years
• 25, 000, 000 years

Which rock layer is the newest?

• A
• B
• C
• D

In Darwin's theory of evolution, he uses his idea of _________________ to explain evolution.

• decent by modification
• species dying out
• when species use new traits

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