Exam 2: Science, Matter, Energy, and Systems

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The _____________________ explains why a barrel of oil can be used only once as fuel.

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second law of thermodynamics

Phosphorus is a key component of DNA, energy storage molecules, bones, and teeth.

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When ice melts into liquid water, a(n) _____________________ change has occurred.

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physical

What group includes infectious germs, and purifies water by breaking down wastes, decomposes organic wastes into nutrients, and provides much of the world's oxygen?

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Scientists openly publish details of their methods and models and continually question their own and other's data and results in a process known as _____________________.

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Time delays can allow an environmental problem to build slowly until it reaches a(n) ____, which causes an often irreversible shift in the behavior of a natural system.

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The place where an organism lives is its

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An example of kinetic energy is

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According to the first law of thermodynamics, energy input is

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Humans interfere with the natural nitrogen cycle by logging activities.

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The variation in a population is called _____________________.

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An important feature of the scientific process is skepticism.

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Discuss two (2) important limitations of science.

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The portion of the atmosphere containing the air we breathe is called the

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Critical Thinking Critical Thinking    -Which two terrestrial ecosystems in the accompanying figures produce the least kilocalories of energy per year? -Which two terrestrial ecosystems in the accompanying figures produce the least kilocalories of energy per year?

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Which aquatic ecosystem has the highest net primary productivity?

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The atomic number is the number of

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Water vapor is a greenhouse gas.

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Which of the following are examples of macromolecules?

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The smallest unit of matter into which an element can be divided and still have its chemical properties is a(n) _____________________.

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