| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
A biological community of interacting organisms and their physical environment is known as:
biome |
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population |
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community |
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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).
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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ventricle, ventricle |
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atrium, atrium |
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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 respiratory and circulatory systems are similar in that they:
deoxygenate blood |
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add carbon dioxide |
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transport nutrients |
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transport oxygen |
Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.
In the heart, the __________ artery and vein manage blood flow to the lungs.
atrial |
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capillary |
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aorta |
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pulmonary |
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 asteroids in the Kuiper belt are composed of which of the following?
frozen methane, ammonia, and water |
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minerals |
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rock |
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gaseous methane, ammonia, and water |
The Kuiper Belt is similar to the asteroid belt but much larger. Extending beyond the orbit of Neptune, it contains objects composed mostly of frozen methane, ammonia, and water. Most notably, the Kuiper Belt is home to Pluto, a dwarf planet that, until a 2006 reclassification, was considered the ninth planet of the solar system.