| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.54 |
| Score | 0% | 71% |
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
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vertebrate |
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bone |
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exoskeleton |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
__________ is caused by a lack of iron in the diet.
diabetes |
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scurvy |
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anemia |
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shingles |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
mixes with |
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pushes above |
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cancels out |
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pushes under |
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.
The two heart chambers that collect blood are called:
valves |
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aorta |
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ventricles |
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atria |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
What prevents blood pumped out of the ventricles from flowing back into the heart?
platelets |
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atria |
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valves |
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capillaries |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.