| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
Which of the following temperatures is least like the others?
absolute zero |
|
0K |
|
-273°C |
|
32°F |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
The ozone layer is in which of Earth's atmospheric layers?
thermosphere |
|
stratosphere |
|
troposphere |
|
mesosphere |
The stratosphere is just above the troposphere and is stratified in temperature with warmer layers higher and cooler layers closer to Earth. This increase in temperature is a result of absorption of the Sun's radiation by the ozone layer.
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets have magnetic fields |
|
the planets have water |
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the planets are Earth-like |
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the planets have moons |
The four planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called terrestrial (Earth-like) planets because, like the Earth, they're solid with inner metal cores covered by rocky surfaces.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
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exoskeleton |
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bone |
|
vertebrate |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
Which of the following describes how a person's genes express themselves in physical characteristics?
DNA |
|
chromotype |
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phenotype |
|
genotype |
A person's genotype is their genetic makeup and includes both dominant and recessive alleles. Phenotype is how the genes express themselves in physical characteristics.