| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.23 |
| Score | 0% | 65% |
Which of the following is the primary difference between a comet and an asteroid?
asteroids have a coma |
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comets orbit the Sun |
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comets have an atmosphere |
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asteroids contain frozen water |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
In the classification of life, which of the following is not a domain?
bacteria |
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archaea |
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eukaryota |
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animalia |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Absolute zero is which of the following?
0°C |
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the coldest temperature possible in the universe |
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the freezing point of oxygen |
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the freezing point of hydrogen |
In contrast to the Celsius scale (measured in degrees centigrade) that fixes 0° at the freezing point of water and the Fahrenheit scale that uses 32°, the Kelvin scale fixes 0 at absolute zero (-273°C) which is the lowest temperature possible in the universe.
Which of blood component carries oxygen?
plasma |
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platelets |
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white blood cells |
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red blood cells |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
The __________ is a system of muscles that allows breathing.
bronchioles |
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pulmonary |
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diaphragm |
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trachea |
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.