Human Impacts On Earth

Animals have adapted to live in places that are just right for them (their environment).

If an environment changes and is now different than what an animal has adapted to live in, what will happen to the number of those animals?

• The number of those animals will decrease (go down).

• The number of those animals will increase (go up).

• The number of those animals will stay the same.

• The animals will change their environment to return it to the way it was.

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How have human activities influenced the spread of invasive species?

• Invasive species are experiencing high extinction rates due to human actions.

• The spread of invasive species is unrelated to human actions.

• Invasive species are more controlled due to human actions.

• Human actions are causing the spread of invasive species to new ecosystems.

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How have human activities such as building increasingly larger cities and converting grassland to farmland affected the extinction rates of living organisms?

• Extinction rates of living organisms are much lower than would normally be expected.

• Extinction rates of living organisms are much higher than would normally be expected.

• Extinction rates of living organisms are about the same as if humans were not around.

• As a result of human efforts, living organisms no longer go extinct.

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Which of the following will lead to fewer deaths of large numbers of animals in an area?

• People taking the land to build new houses, causing the animals to lose space to live and find food.

• People removing too many nutrients and resources from the land, causing the animals not to have any food.

• People building homes in a smaller area.

• People polluting the land, causing the animals to get sick.

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Which human activity has a positive impact on ocean fish populations?

¿Qué actividad humana tiene un impacto positivo en las poblaciones de peces del océano?

• Allowing trash dumping into the oceans.

  
  

  Permitir el vertido de basura en los océanos.

• Improved technology for catching fish.

  
  

  Tecnología mejorada para la captura de peces.

• Allowing fishermen to catch as many fish as possible.

  
  

  Permitir a los pescadores capturar la mayor cantidad de peces posible.

• Decreasing the amount of pollution that enters the oceans.

  
  

  Disminuir la cantidad de contaminación que ingresa a los océanos.

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Biodiversity refers to the number of different species. What difference in biodiversity would you expect between an undisturbed wetland ecosystem and one that has been partially drained and replaced with farmland?

• The farmland would have a richer and more complex food web.

• The wetland would have more biodiversity.

• The two ecosystems would have relatively similar biodiversity.

• The farmland would have more biodiversity.

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Which of the following is a major way that humans have made water habitats less livable for animals?

• Removed habitats to build human settlements.

• Altered habitats to create parkland.

• Introduced pollutants like fertilizers.

• Increased soil erosion.

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Which statement explains how building homes in an area affects the organisms living there?

• The organisms are transported to new locations.

• The organisms adjust to having less space.

• The organisms increase in number due to new food sources.

• The organisms decrease in number due to habitat loss.

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Global warming is caused by the burning of fossil fuels. Which statement BEST explains which animals will be affected by global warming?

• The animals who live near oceans will be affected by a rise in sea levels.

• All animals can move to cooler places, so they will not be affected.

• Many animals will be affected because both oceans and air are warming up.

• Only a few animals, such as polar bears, will be affected by global warming.

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Which statement about human impacts on other living things is TRUE?

• The number of endangered and extinct species is increasing because of human activity.

• Human activity has only had a small impact on other species compared to natural causes.

• The number of species that are going extinct because of human activity is balanced out by new species being formed.

• Human activity mostly impacts animal species, but not plants.

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