Unit Test — Unit test Answers
The image illustrates a human-induced environmental change.
Scientists have a theory about the relationship between climate and biodiversity. Which best describes this theory?
Paulo makes the argument that the asteroid strike that likely contributed to the extinction of the dinosaurs was a short-tem environmental change because it happened so quickly.
Gwen is researching the effects of a small asteroid impact in an area that has started to regrow after being hit ten years ago. She considers the event to be a long-term change because the species of plants that were present had to start completely over from seeds after all of the plants in the area were killed by the impact.What is the error in Gwen’s thinking?
After a volcanic eruption, lava flowed over an area and then cooled to form a thick layer of new rock. One thousand years later, a thriving forest with diverse flora and fauna is found in that area, even though evidence suggests that several large forest fires have occurred.
Which statement describes the current theory about the relationship between the human population and mass extinction?
In which way is primary succession similar to secondary succession?
Which best protects animal species that are endangered due to overhunting?
Rebekah is studying lichens growing on a cooled lava field. What is Rebekah most likely researching?
Eunice is a scientist studying a grassland area in the midwestern United States. It contains many species of flora and fauna that coexist and remain relatively balanced. There have also been no recent disturbances in the area.
Why are nonnative species a threat to biodiversity?
In the 1980s laws were passed to reduce the amount of certain chemicals used by companies and individuals. According to these laws, the use of chlorofluorocarbons, or CFCs, should be reduced and eventually eliminated. These compounds contain chlorine and cause problems when released into the Earth’s atmosphere.
Which human-induced change results in increased competition caused by an initial increase in the number of organisms in a habitat?
Underground mammals, such as the ancestors of moles, are thought to have first evolved as the dinosaurs died out.
Mosasaurs were large marine reptiles that resembled a cross between a crocodile and a giant iguana. The mosasaurs are believed to have completely died out after a huge asteroid impact caused Earth to drastically change.
Which graph best represents the relationship between sustainability and biodiversity?
Although it is against the law, people hunt and capture mountain gorillas in Africa. They sell the baby gorillas for large sums of money.
Which statements describe global warming? Select two answer choices.Global warming can be decreased through deforestation.Global warming occurs naturally.Global warming results from the buildup of nutrients in runoff.Global warming is likely increased by humans.Global warming is enhanced by nonnative species.
Which best explains why a decrease in the types of insects in an ecosystem reduces the sustainability of the ecosystem?
Secondary succession would most likely be taking place in a(n)
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