Ques:Q: What are the most common causes of brain injuries? Choices: - excessive shaking - lightning strikes - alcohol poisoning - falls A:

Ans:falls
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Ques:Q: Photochemical smog consists mainly of what? Choices: - acid - oxygen - carbon - ozone A:

Ans:ozone
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Ques:Q: When an electron transitions from an excited state to a less excited state, or ground state, the difference in energy is emitted as a what? Choices: - neutron - nucleus - quark - photon A:

Ans:photon
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Ques:Q: Burning gas to run our cars is an example of how human activity is contributing to what global event? Choices: - ozone change - carbon change - metamorphic change - climate change A:

Ans:
climate change
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