. Which of the following does NOT contribute to the human impact on the environment?     A)  The size of the human population.   B)  Human affluence.   C)  The rapid evolution of humans compared to other species.   D)  The speed of change caused by humans.   8. Which of the following may be true of atmospheric CO2?   A)  The ocean will absorb the excess atmospheric CO2.   B)  Plant photosynthesis cannot compensate for increased atmospheric CO2.   C)  When tropical forests are logged, additional CO2 is released into the atmosphere.   D)  As permafrost melts, more atmospheric CO2 will be absorbed.

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Physical and Chemical features

The physical property of a compound could be determined without modifying the originality of the compound. Examples of physical properties are density, hardness, color, boiling, and melting point. The chemical property expresses the ability of a compound to undergo a particular chemical change.