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Chapter 9 Review

Chapter 9 Review . Jamie Bell. 9-1.

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Chapter 9 Review

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  1. Chapter 9 Review Jamie Bell

  2. 9-1 Humans have caused the extinction rate to increase by converting grasslands, forests, and wetlands into urban areas. Climate change is also a large factor in extinction. Scientists document records of fossils to try and compare extinction rates from back then to present time. They have predicted that species and biodiversity loss will increase by the next 50-100 years. An Endangered Species Act has been put in effect.

  3. Vocabulary Review Biological extinction (when a species can no longer be found anywhere on earth) Background extinction rate (natural, low rate of extinction) Extinction rate (a percentage or number of species that go extinct within a certain time period such as a year) Mass extinction (the extinction of many species in a short period of time) Endangered species (few individual survivors that the species could soon become extinct) Threatened species (has enough remaining species to survive short term)

  4. 9-2 The world’s species provide support for our life system and keep us and other species alive. They also proved economic services such as food crops, fuelwoodand lumber, paper, and medicine. We should care because it would take 5 million to 10 million years for natural speciation to rebuild the biodiversity. Species also have the right to exist so we have a ethnical responsibility to protect them.

  5. 9-3 The loss oh habitat is a major threat towards species. Harmful invasive species also accelerate extinction because they are not used to the predators, competition, parasites, or pathogens in the new habitat. This introduction can cause ecological disruption in the environment. An example of introducing a new species to an areas and causing harm is the kudzu vine.

  6. 9-3.. Human population growth accelerates species extinction because we leave a ecological footprint due to the damage we cause wherever we are. This has resulted in the loss of many species. Pollution and climate change is also a factor is accelerating extinction. Pollution itself can wipe out a species and change the climate. Climate change causes biodiversity to decrease because it affects the migration of animals and growth of plants.

  7. 9-3… Overexploitation speeds up extinction because it is the act of killing an animal for profit. Many people illegally kill protected animals. Many animals have become extinct due to poachers. This hurts biodiversity because each species plays a role in their environment. The removal of a certain species can speed extinction.

  8. Vocabulary Review HIPPCO (Habitat destruction, degradation, and fragmentation; Invasive species; Population growth and increasing use of resources; Pollution; Climate change; and Over exploitation) Habitat fragmentation (When a large, intact area of habitat such as a forest or natural grassland is divided)

  9. 9-4 The rising rate of extinction can be reduced by enforcing laws to protect the biodiversity. National environmental laws and international treaties can tell people how to regulate pollution, killing of animals, and the way certain land is being used. These laws can also provide wildlife sanctuaries that could preserve the biodiversity of an area.

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