Which statement supports the theory of natural selection

• All organisms produce more offspring than can survive.
• Organisms live in harmony with one another despite limited resources.
• Organisms with favorable traits are more likely to die.
• Over time advantageous traits will be found in more of the population.

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What will most likely happen if a species can no longer produce offspring?

• It will become extinct.
• It will evolve into another species.
• It will move into a new environment and adapt.
• It will begin to mutate into another organism.

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Which part of Darwin's theory of evolution may be used to describe the results of when lions prey on antelope?

• natural selection
• survival of the fittest
• adaptation to environment
• variation in species

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What role does genetic variation play in the evolution of species?

• It reduces the chance that species will possess characteristics well-suited for a changing environment.
• It increases the chance that species will possess characteristics well-suited for a changing environment.
• It allows multicellular organisms to change their traits during their lifetimes.
• It allows unicellular organisms to change their DNA after they die.

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Why is DNA important?

• it is very small and very complicated
• it's in everything
• it serves as the blueprint for traits of all living things
• because we eat it every day for energy

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Which organelle is DNA usually found in?

• cell membrane
• vacuole
• ribosome
• nucleus

The drawing shows the structure of what molecule?

• A DNA molecule
• A lipid molecule
• A carbohydrate molecule
• A protein molecule

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What are sections of DNA called?

• DNA

• Genes

• Chromosomes

• Nucleus

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A gene determines a __________ such as eye or hair color.

• nucleus

• DNA

• chromosome

• Trait

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How many pairs of chromosomes do humans have?

• 21

• 22

• 23

• 24