| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.15 |
| Score | 0% | 63% |
A biological community of interacting organisms and their physical environment is known as:
community |
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biome |
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population |
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ecosystem |
An ecosystem is a biological community of interacting organisms and their physical environment. This includes both the biotic (living) and abiotic (non-living).
A __________ is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound.
neutron |
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ion |
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molecule |
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isotope |
A molecule is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound. The molecules of elements consist of two or more similar atoms, the molecules of compounds consist of two or more different atoms.
In the heart, blood flows from the right __________ to the lungs then back to the heart via the left __________.
ventricle, ventricle |
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ventricle, atrium |
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atrium, ventricle |
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atrium, 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.
In the metric system, what prefix represents 103?
mega |
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kilo |
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milli |
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centi |
Kilo is the metric system prefix for 103.
Sound travels fastest through which of the following media?
water |
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vacuum |
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metal |
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air |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).