| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.46 |
| Score | 0% | 69% |
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?
conduction |
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radiation |
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reflection |
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convection |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Which of the following members of the food chain are most alike?
scavengers and decomposers |
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producers and tertiary consumers |
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primary consumers and omnivores |
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herbivores and autotrophs |
Like decomposers, scavengers also break down the dead bodies of plants and animals into simple nutrients. The difference is that scavengers operate on much larger refuse and dead animals (carrion). Decomposers then consume the much smaller particles left over by the scavengers.
Arteries carry __________ blood at __________ pressure.
oxygenated, high |
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oxygenated, low |
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deoxygenated, low |
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deoxygenated, high |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
The number system most used in science is the:
British system |
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English system |
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metric system |
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American system |
The metric system is a number system that designates one base unit for each type of measurement. For example, the base unit for length is the meter and the base unit for mass is the gram.
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
somatic |
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peripheral |
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autonomic |
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central |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.