| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
Which of the following members of the food chain are most alike?
herbivores and autotrophs |
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primary consumers and omnivores |
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scavengers and decomposers |
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producers and tertiary consumers |
Like decomposers, scavengers also break down the dead bodies of plants and animals into simple nutrients. The difference is that scavengers operate on much larger refuse and dead animals (carrion). Decomposers then consume the much smaller particles left over by the scavengers.
In the classification of life, bacteria, archaea and eukaryota are which of the following?
species |
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domains |
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classes |
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kingdoms |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Which of the following is not one of the outer planets?
Venus |
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Jupiter |
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Uranus |
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Neptune |
In contrast to the solid terrestrial planets, the outer planets (Jupiter, Saturn, Uranus, and Neptune) consist of hydrogen and helium gas and water.
The coldest point in the Earth's atmosphere is reached in which atmospheric layer?
mesosphere |
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troposphere |
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thermosphere |
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stratosphere |
In the mesosphere, temperature again drops as altitude increases until the coldest point in the Earth's atmosphere, the mesopause, is reached where temperatures fall to −225 °F (−143 °C).
Which of the following describes the Earth's mantle?
hot |
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dense |
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all of these |
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makes up most of Earth's volume |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.