| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.31 |
| Score | 0% | 66% |
Small rocks shed by asteroids and comets that reach the earth are called:
shooting stars |
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meteors |
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meteorites |
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meteoroids |
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.
Menstruation occurs when:
the fetus is formed |
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the ovum fails to become fertilized |
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the ovum becomes fertilized |
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the zygote is formed |
If the ovum fails to become fertilized, the lining of the uterus sloughs off during menstruation. From puberty to menopause, this cycle of menstruation repeats monthly (except during pregnancy).
In the food chain, consumers are classified as which of the following?
all of these |
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primary |
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tertiary |
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secondary |
Most animals consume other organisms to survive. Consumers (heterotrophs) are divided into three types, primary, secondary, and tertiary, based on their place in the food chain.
A major difference between sound waves and light waves is which of the following?
a sound wave cannot travel through a vacuum |
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a sound wave is mechanical while a light wave is electromagnetic |
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all of these are correct |
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a sound wave is much slower than a light wave |
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.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
molecule |
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compound |
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atom |
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element |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.