| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
Which of the following states of matter exists at the lowest temperature?
solid |
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liquid |
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gas |
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none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Scavengers break down the dead bodies of plants and animals into which of the following?
simple nutrients |
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carrion |
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complex carbohydrates |
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producers |
Like decomposers, scavengers also break down the dead bodies of plants and animals into simple nutrients. The difference is that scavengers operate on much larger refuse and dead animals (carrion). Decomposers then consume the much smaller particles left over by the scavengers.
The first step in the water cycle is:
precipitation |
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reclamation |
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evaporation |
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infiltration |
The water (hydrologic) cycle describes the movement of water from Earth through the atmosphere and back to Earth. The cycle starts when water evaporates into a gas from bodies of water like rivers, lakes and oceans or transpirates from the leaves of plants.
The respiratory and circulatory systems are similar in that they:
deoxygenate blood |
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transport oxygen |
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transport nutrients |
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add carbon dioxide |
Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.
pH is a scale that measures of how basic or acidic a solution is. A solution with a pH of 9 is:
water |
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acidic |
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alkaline |
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neutral |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.