| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
|
bone |
|
exoskeleton |
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vertebrate |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
The angle of reflection is equal to which the following?
refractive index |
|
angle of incidence |
|
focal point |
|
90° |
The law of reflection specifies how waves, including light waves, bounce off of surfaces. Specifically, the angle of incidence of the approaching wave is equal to the angle of reflection of the reflected wave as measured from a line perpendicular (90°) to the surface.
When compared to eukaryotic cells, prokaryotic cells are:
more complex |
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less complex |
|
none of these |
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similarly complex |
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.
-40°F is how many °C?
-40 |
|
\({40 \over 9}\) |
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\(-{40 \over 9}\) |
|
-8 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
Arteries carry __________ blood at __________ pressure.
deoxygenated, low |
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oxygenated, high |
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deoxygenated, high |
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oxygenated, low |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.