| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.67 |
| Score | 0% | 73% |
When two air masses meet and neither is displaced, what kind of front is present?
occluded |
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stationary |
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cold |
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warm |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
reflection |
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refraction |
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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.
In the heart, blood flows from the __________ ventricle to the lungs then back to the heart via the __________ atrium.
right, right |
|
right, left |
|
left, right |
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left, left |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
vertebrate |
|
exoskeleton |
|
bone |
|
endoskeleton |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
A large naturally occurring community of flora and fauna occupying a major habitat is:
a biome |
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a population |
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a food chain |
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a community |
A biome is a large naturally occurring community of flora (plants) and fauna (animals) occupying a major habitat (home or environment).