| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.87 |
| Score | 0% | 57% |
Meteoroids, meteors and meteorites are categorized based on which of the following?
their density |
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their temperature |
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their location |
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their size |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
In cell biology, what part of the cell contains organelles?
cell wall |
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cytoplasm |
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nucleus |
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cell membrane |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles.
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 water |
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the planets have magnetic fields |
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the planets are Earth-like |
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.
In the food chain, omnivores may be which of the following?
secondary consumers or scavengers |
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primary or secondary consumers |
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primary or tertiary consumers |
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secondary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
In the heart, the __________ artery and vein manage blood flow to the lungs.
atrial |
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capillary |
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aorta |
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pulmonary |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.