| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
In the metric system, what prefix represents 10-3?
mega |
|
centi |
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milli |
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kilo |
In the metric system, milli is the prefix for 10-3.
Meteoroids, meteors and meteorites are categorized based on which of the following?
their temperature |
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their size |
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their density |
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their location |
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.
A major difference between sound waves and light waves is which of the following?
a sound wave is much slower than a light wave |
|
all of these are correct |
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a sound wave is mechanical while a light wave is electromagnetic |
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a sound wave cannot travel through a vacuum |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
Secondary consumers that also eat producers are known as:
herbivores |
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carnivores |
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scavengers |
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omnivores |
Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.
Blood pressure is generally highest in which of the following?
arteries |
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veins |
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heart |
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capillaries |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.