| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
Which of these is not a phase in cell division?
megaphase |
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anaphase |
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interphase |
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cytokinesis |
Cell division is the process by which cells replicate genetic material in the nucleus and consists of several phases, beginning with interphase and ending with cytokinesis.
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets have moons |
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the planets have magnetic fields |
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the planets are Earth-like |
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the planets have water |
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.
Cirrus clouds are thin, wispy clouds composed of ice crystals. At what elevation to cirrus clouds form?
ground level |
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mid-altitude |
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high-altitude |
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low-altitude |
Cirrus clouds are thin, wispy high-altitude clouds composed of ice crystals that originate from the freezing of supercooled water droplets. Cirrus clouds generally occur in fair weather and point in the direction of air movement at their elevation.
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
capillaries |
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bronchioles |
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diaphragms |
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blood cells |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
The hottest of Earth's atmospheric layers is which of the following?
mesosphere |
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thermosphere |
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troposphere |
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stratosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.