| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.09 |
| Score | 0% | 62% |
Which of the following is not true of light waves?
travel faster than sound waves |
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are mechanical waves |
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can travel through a vacuum |
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are electromagnetic waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
In the heart, blood flows from the right __________ to the lungs then back to the heart via the left __________.
atrium, ventricle |
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atrium, atrium |
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ventricle, ventricle |
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ventricle, atrium |
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.
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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inherent |
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potential |
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gravitational |
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.
Which of these is not a phase in cell division?
cytokinesis |
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megaphase |
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anaphase |
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interphase |
Cell division is the process by which cells replicate genetic material in the nucleus and consists of several phases, beginning with interphase and ending with cytokinesis.
Scavengers break down the dead bodies of plants and animals into which of the following?
complex carbohydrates |
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producers |
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simple nutrients |
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carrion |
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.