| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.27 |
| Score | 0% | 65% |
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
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secondary or tertiary consumers |
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secondary consumers or scavengers |
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primary or secondary consumers |
Secondary or tertiary consumers may be omnivores.
Which of the following would be used in eye glasses to correct farsightedness?
convex lens |
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convex mirror |
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concave mirror |
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concave lens |
Unlike curved mirrors that operate on the principle of reflection, lenses utilize refraction. A convex lens is thicker in the middle than on the edges and converges light while a concave lens is thicker on the edges than in the middle and diffuses light. A common use for curved lenses is in eye glasses where a convex lens is used to correct farsightedness and a concave lens is used to correct nearsightedness.
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
cancels out |
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pushes under |
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mixes with |
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pushes above |
A cold front is a warm-cold air boundary with the colder air replacing the warmer. As a cold front moves into an area, the heavier cool air pushes under the lighter warm air that it is replacing. The warm air becomes cooler as it rises and, if the rising air is humid enough, the water vapor it contains will condense into clouds and precipitation may fall.
__________ is caused by a lack of iron in the diet.
diabetes |
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anemia |
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shingles |
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scurvy |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
The rows of the Periodic Table of the Elements are called:
shells |
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periods |
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groups |
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families |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.