| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
Which of the following describes the Earth's outer core?
makes up most of the Earth's volume |
|
solid |
|
liquid |
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primarily solid |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
When two air masses meet and neither is displaced, what kind of front is present?
cold |
|
warm |
|
stationary |
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occluded |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
In cell biology, the primary difference between anaerobic and aerobic respiration is that aerobic respiration requires:
water |
|
oxygen |
|
mitochondria |
|
sugar |
Some plant cells produce their own energy through photosynthesis which is the process by which sunlight, carbon dioxide, and water react to make sugar and oxygen. Animal cells cannot produce their own energy and, instead, generate energy when mitochondria consume outside sugar and oxygen through aerobic respiration.
The __________ nervous system controls voluntary actions.
peripheral |
|
autonomic |
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somatic |
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central |
Part of the peripheral nervous system, the somatic nervous system is made up of nerve fibers that send sensory information to the central nervous system and control voluntary actions.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
vertebrate |
|
endoskeleton |
|
exoskeleton |
|
bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.