| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.87 |
| Score | 0% | 57% |
Blood is created in:
the liver |
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red blood cells |
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bone marrow |
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the heart |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
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primary or secondary consumers |
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secondary or tertiary consumers |
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secondary consumers or scavengers |
Secondary or tertiary consumers may be omnivores.
Which of the following is not true about simple magnets?
opposite poles repel each other |
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opposite poles attract each other |
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same 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.
Small rocks shed by asteroids and comets that reach the earth are called:
meteoroids |
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meteors |
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meteorites |
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shooting stars |
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.
During continental drift, the drifting plates move across which of the following?
sediment |
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water |
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fault lines |
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liquid mantle |
The crust and the rigid lithosphere (upper mantle) is made up of approximately thirty separate plates. These plates more very slowly on the slightly more liquid mantle (asthenosphere) beneath them. This movement has resulted in continental drift which is the gradual movement of land masses across Earth's surface. Continental drift is a very slow process, occurring over hundreds of millions of years.