| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
Blood pressure is generally highest in which of the following?
arteries |
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capillaries |
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veins |
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heart |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
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secondary consumers or scavengers |
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secondary or tertiary consumers |
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primary or secondary consumers |
Secondary or tertiary consumers may be omnivores.
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
pushes above |
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mixes with |
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pushes under |
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cancels out |
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.
What part of the food chain serves only as food for other organisms?
secondary consumers |
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decomposers |
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producers |
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primary consumers |
Producers (autotrophs) serve as a food source for other organisms. Typical producers are plants that can make their own food through photosynthesis and certain bacteria that are capable of converting inorganic substances into food through chemosynthesis
Which of blood component allows blood to clot?
white blood cells |
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plasma |
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platelets |
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red blood cells |
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.