Answer the following question given this paragraph: Birds evolved from a reptile ancestor but they are very different from reptiles today. Birds are also the most numerous tetrapod vertebrates. Q: Birds are the most numerous type of what vertebrates? Choices: - arachnipod - amphipod - ornithopod - tetrapod A:
tetrapod
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Answer the following question given this paragraph: A: The wave travels down the string to the end. The string vibrates up and down at right angles to the direction of the wave. Q: When a wave travels down a string, the string vibrates up and down at right angles to the wave's what? Choices: - frequency - pressure - gravity - direction A:
direction
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Answer the following question given this paragraph: Echo sounders were used to search for enemy submarines during World War II. The depths they recorded allowed scientists to piece together bathymetric maps of the seafloor. Multi-beam sounders work on research vessels today. Q: What do waves deposit in relatively quiet areas along a shore? Choices: - fish - mud - snow - sand A:
sand
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Answer the following question given this paragraph: Unfortunately, the layer of good ozone is being destroyed by air pollution. The chief culprits are chlorine and bromine gases. They are released in aerosol sprays, coolants, and other products. Loss of ozone has created an ozone hole over Antarctica. Ozone depletion results in higher levels of UV radiation reaching Earth. In humans, this increases skin cancers and eye cataracts. It also disturbs the nitrogen cycle, kills plankton, and disrupts ocean food webs. The total loss of the ozone layer would be devastating to most life. Its rate of loss has slowed with restrictions on pollutants, but it is still at risk. Q: Chlorine and bromine gases released into the atmosphere have helped damage what layer of the atmosphere? Choices: - stratospheric layer - carbon layer - polluted layer - ozone layer A:
ozone layer
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