| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
Which of blood component fights infection?
white blood cells |
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platelets |
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plasma |
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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.
Molecules and atoms that are inputs to a chemical reaction are known as which of the following?
fuel |
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products |
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components |
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reactants |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Which of the following is sedimentary rock?
sandstone |
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basalt |
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slate |
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obsidian |
The Earth's rocks fall into three categories based on how they're formed. Igneous rock (granite, basalt, obsidian) is formed from the hardening of molten rock (lava), sedimentary rock (shale, sandstone, coal) is formed by the gradual despositing and cementing of rock and other debris, and metamorphic rock (marble, slate, quartzite) which is formed when existing rock is altered though pressure, temperature, or chemical processes.
In the food chain, omnivores may be which of the following?
secondary or tertiary consumers |
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primary or tertiary consumers |
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primary or secondary consumers |
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secondary consumers or scavengers |
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 under |
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cancels out |
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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.