Q: Birds are the most numerous type of what vertebrates? Choices: - arachnipod - amphipod - ornithopod - tetrapod A:
tetrapod
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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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Q: What do waves deposit in relatively quiet areas along a shore? Choices: - fish - mud - snow - sand A:
sand
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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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