| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.55 |
| Score | 0% | 51% |
Which of the following is not true about simple magnets?
same poles repel each other |
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opposite poles attract each other |
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opposite poles repel each other |
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all of these are untrue |
Simple magnets have two poles, north and south, and opposite poles attract each other (N attracts S, S attracts N). Likewise, the same pole of two magnets repel (N repels N, S repels S). The Earth has a magnetic field and North and South Poles which enables the use of a magnetic compass to determine direction.
Meteoroids, meteors and meteorites are categorized based on which of the following?
their location |
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their density |
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their size |
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their temperature |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
Veins __________ blood at __________ pressure.
deoxygenated, low |
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deoxygenated, high |
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oxygenated, low |
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oxygenated, high |
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.
Examples of primary consumers include:
rats |
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fish |
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all of these |
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cows |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
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secondary consumers or scavengers |
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secondary or tertiary consumers |
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primary or secondary consumers |
Secondary or tertiary consumers may be omnivores.