| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.03 |
| Score | 0% | 61% |
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
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secondary or tertiary consumers |
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primary or secondary consumers |
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secondary consumers or scavengers |
Secondary or tertiary consumers may be omnivores.
Veins carry blood __________ the heart.
away from |
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back to |
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all of these |
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within |
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.
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
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power |
|
work |
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kinetic energy |
Force is applied to change an object's speed or direction of motion.
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
kinetic |
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gravitational |
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inherent |
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potential |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
What part of the brain is responsible for the major senses (thinking, hearing, seeing)?
cerebrum |
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medulla |
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cerebellum |
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brainstem |
The cerebrum is the major part of the brain and is responsible for the main senses (thinking, hearing, seeing).