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The pia mater is connected to the dura mater to anchor the spinal cord in place at paired structures calledA) coccygeal ligaments.B) the conus medullaris.C) denticulate ligaments.D) the filum terminale.E) None of the answers are correct.

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Which of the following is a likely explanation for the difference shown in the graph for the percent of animals and the percent of plants threatened by transient-human activity?AThe exhaust from off-road vehicles releases more carbon dioxide into the local ecosystem, promoting a higher level of photosynthesis in plants resulting in less of a threat to plants than to animals.BInvasive species damage soil and affect water availability, causing a greater threat to plants than to animals.CAnimals are mobile and able to avoid trampling, but because plants are stationary, transient-human activity affects a larger percent of plants than of animals.DDisplaced animals are now in direct competition with more species that share a similar niche, so transient-human activity affects a larger percent of animals than of plants.

Based on the data above, which of the following best supports the hypothesis that the Arctic (latitudes greater than 66°N) experienced accelerated warming compared to the rest of the planet from 2011 to 2017 ?AThe smallest average surface-temperature change occurred at about −80° latitude in the Antarctic.BThe largest areas with surface-temperature changes greater than a 4°C increase are found in the Arctic.CNorthern Australia warmed more than the ocean off the west coast of Australia did.DThe average surface-temperature change at the equator was about a 0.6°C increase.

Which of the following best describes the greenhouse effect on Earth?AGreenhouse gases trap heat near Earth's surface, keeping the average surface temperature constant.BGreenhouse gases create a relatively warm inversion layer, which traps pollutants near Earth's surface.CGreenhouse gases filter out UV-BUV-B and UV-CUV-C radiation, shielding living things from harmful solar radiation.DGreenhouse gases are emitted from human activities such as the combustion of fossil fuels and agricultural practices.

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