| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.98 |
| Score | 0% | 60% |
The two heart chambers that collect blood are called:
atria |
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aorta |
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valves |
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ventricles |
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.
The Sun is a __________-type main-sequence star.
S |
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G |
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E |
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D |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
What kind of weather front is likely to create clouds and storms?
cold front |
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temperate front |
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stationary front |
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warm front |
A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Warm air at the surface pushes above the cool air mass creating clouds and storms.
As part of digestion, the liver produces bile which breaks down:
starches |
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sugars |
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protein |
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fat |
The liver produces bile which emulsifies (separates) fat.
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?
reflection |
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convection |
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radiation |
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conduction |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.