| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.77 |
| Score | 0% | 55% |
Which of the following is the narrowest classification of life?
domain |
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species |
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family |
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genus |
The narrowest classification of life, species, contains organisms that are so similar that they can only reproduce with others of the same species.
-40°F is how many °C?
\(-{40 \over 9}\) |
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-40 |
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-8 |
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\({40 \over 9}\) |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
Changes to an object's speed or direction of motion are caused by which of the following?
power |
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kinetic energy |
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work |
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a force |
Force is applied to change an object's speed or direction of motion.
Which of these does not contain oxygenated blood?
right atrium |
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left ventricle |
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aorta |
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pulmonary vein |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.
Which of the following is the primary difference between a comet and an asteroid?
comets orbit the Sun |
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asteroids contain frozen water |
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asteroids have a coma |
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comets have an atmosphere |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.