Scientific Evolution

The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____.

• the daughter product

• geologic time

• the half-life

• the half-time

The graph shows the decay of a radioactive material over time. 
How long does it take for this radioactive material to decay through 2 half-lives? 

• 1 x 10³ years
• 5 x 10³ years
• 10 x 10³ years
• 40 x 10³ years

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Dogs such as Chihuahuas are examples of....

• Artificial Selection 
• Natural Selection 
• Mutations 

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What is the definition of natural selection?

• Genes that are chosen by humans such as farmers and ranchers
• Organisms that are chosen by environmental pressures such as climate, available food, predators and habitat.
• Dogs and Wolves
• Genes that are chosen by scientist and academics. 

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The Aztecs and Maya Tribes of Mexico where some of the first humans to slowly change wild corn to the corn we know today. What process did these tribes use?

• Natural Selection
• Artificial Selection "Selective Breeding"
• Mitosis
• Cell Membrane

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How are new traits introduced into a population?

• Photosynthesis
• Cell Membrane
• Turtles 
• Mutations 

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This animal is a product of ...

• Natural Selection 
• Artificial Selection 
• Human Made
• Selective Breeding 

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If a mouse population changes color from white to black over many generations due to their environment, what selection is taking place?

• Natural Selection 
• Selective Breeding
• Artificial Selection 
• Hydrogen and Helium 

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Scientist have created larger and sweeter strawberries for humans to consume (eat). What process was used?

• Natural Selection 
• Artificial Selection 
• Cellular Respiration 
• Environmental Natural Selection 

What is a change in an organism that allows for it to survive in its environment?

• homologous
• vestigial
• variation
• adaptation

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