| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
refraction |
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reflection |
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sound radiation |
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Doppler effect |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
I biome is made up of naturally occurring flora and fauna. Fauna is which of the following?
habitats |
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minerals |
|
plants |
|
animals |
A biome is a large naturally occurring community of flora (plants) and fauna (animals) occupying a major habitat (home or environment).
Which of the following is the narrowest classification of life?
family |
|
genus |
|
species |
|
domain |
The narrowest classification of life, species, contains organisms that are so similar that they can only reproduce with others of the same species.
When compared to eukaryotic cells, prokaryotic cells are:
more complex |
|
none of these |
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less complex |
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similarly complex |
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.
Which of the following does not represent the freezing point of water?
273K |
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32°F |
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0°F |
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0°C |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.