| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
Which of the following describes the Earth's outer core?
primarily solid |
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solid |
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liquid |
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makes up most of the Earth's volume |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
In the metric system, what prefix represents 103?
milli |
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kilo |
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mega |
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centi |
Kilo is the metric system prefix for 103.
Plant cells may generate energy through which of the following?
all of these |
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aerobic respiration |
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photosynthesis |
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anaerobic respiration |
Some plant cells produce their own energy through photosynthesis which is the process by which sunlight, carbon dioxide, and water react to make sugar and oxygen. Animal cells cannot produce their own energy and, instead, generate energy when mitochondria consume outside sugar and oxygen through aerobic respiration.
The number system most used in science is the:
British system |
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English system |
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American system |
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metric system |
The metric system is a number system that designates one base unit for each type of measurement. For example, the base unit for length is the meter and the base unit for mass is the gram.
Which of these parts of digestion takes place in the mouth?
breaking down fats |
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absorbing nutrients |
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breaking down starches |
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breaking down proteins |
Digestion begins in the mouth where the teeth and tongue break down food mechanically through chewing and saliva, via the enzyme salivary amylase, starts to break starches down chemically. From the mouth, food travels down the esophagus where contractions push the food into the stomach.