| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
The envelope of gases surrounding the planet is called the:
lithosphere |
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geosphere |
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atmosphere |
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hydrosphere |
The biosphere is the global ecological system integrating all living beings and their relationships. This includes their interactions with the lithosphere (the rigid outer part of the earth, consisting of the crust and upper mantle), hydrosphere (all surface water), and atmosphere (the envelope of gases surrounding the planet).
A transition zone between two air masses is called:
thunderstorm |
|
front |
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fog |
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boundary |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
The __________ is a system of muscles that allows breathing.
diaphragm |
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trachea |
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bronchioles |
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pulmonary |
The diaphragm is a system of muscles that allows breathing. During inhalation, the diaphragm expands and air rushes in to fill the space created. Then, during exhalation, the diaphragm contracts and forces the air back out.
Which of the following does not represent the freezing point of water?
32°F |
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0°C |
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0°F |
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273K |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
In cell biology, where does DNA replication take place?
nucleus |
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Golgi apparatus |
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mitochondria |
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cytoplasm |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.