| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.31 |
| Score | 0% | 66% |
An element in the physical state of __________ maintains a constant volume and shape.
liquid |
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gas |
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solid |
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gel |
An element in a solid state has atoms or molecules that are constricted and do not move freely. Solids maintain a constant volume and shape and exist at a lower temperature than liquids or gases.
Blood pressure is generally highest in which of the following?
capillaries |
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arteries |
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veins |
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heart |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.
Which of the following is true about species groups?
a population is made up of a group of communities |
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an ecosystem is a biological population |
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a community is made up of a group of populations |
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a biome is a made up of a group of biospheres |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.
What prevents blood pumped out of the ventricles from flowing back into the heart?
atria |
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capillaries |
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valves |
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platelets |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
These clouds grow upward and can develop into cumulonimbus or thunderstorm clouds.
cumulus clouds |
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cirrus clouds |
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nimbus clouds |
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stratus clouds |
Cumulus clouds are large, puffy, mid-altitude clouds with a flat base and a rounded top. These clouds grow upward and can develop into a cumulonimbus or thunderstorm cloud.