| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.50 |
| Score | 0% | 70% |
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
exoskeleton |
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vertebrate |
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endoskeleton |
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bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
The rows of the Periodic Table of the Elements are called:
groups |
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families |
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periods |
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shells |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
Which of the following is the narrowest classification of life?
domain |
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family |
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species |
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genus |
The narrowest classification of life, species, contains organisms that are so similar that they can only reproduce with others of the same species.
The respiratory and circulatory systems are similar in that they:
transport oxygen |
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transport nutrients |
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deoxygenate blood |
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add carbon dioxide |
Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.
Veins __________ blood at __________ pressure.
deoxygenated, high |
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oxygenated, low |
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oxygenated, high |
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deoxygenated, low |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.