| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.78 |
| Score | 0% | 76% |
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
proton |
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electron |
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neutron |
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atom |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
convection |
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reflection |
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conduction |
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radiation |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Which of these vitamins doesn't come from food?
D |
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C |
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A |
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Potassium |
Vitamins are necessary for a wide variety of bodily processes. Some vitamins like Vitamins A and C come from diet but others, like Vitamin D, are generated in response to sunlight.
What prevents blood pumped out of the ventricles from flowing back into the heart?
capillaries |
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valves |
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platelets |
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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.
An air mass is a large body of air that has which of the following characteristics?
all of these |
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similar temperature |
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similar density |
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similar moisture |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.