| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.83 |
| Score | 0% | 57% |
Small rocks shed by asteroids and comets that reach the earth are called:
shooting stars |
|
meteorites |
|
meteoroids |
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meteors |
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.
The process of diffusion allows __________ to exchange oxygen, carbon dioxide, nutrients, and waste between blood and the body's cells.
arteries |
|
red blood cells |
|
capillaries |
|
veins |
Capillaries are small thin-walled vessels that permit the exchange of oxygen, carbon dioxide, nutrients, and waste between blood and the body's cells. This process of exchange is called diffusion.
In fermentation, what replaces oxygen in anaerobic respiration?
lactic acid or alcohol |
|
water |
|
ascorbic acid or peptides |
|
starches |
If no oxygen is present, cellular respiration is anaerobic and will result in fermentation where either lactic acid or alcohol is used instead of oxygen.
Which of the following does not represent the freezing point of water?
0°F |
|
0°C |
|
273K |
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32°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
What part of the nervous system controls simple reflexes?
cerebrum |
|
spinal cord |
|
autonomic |
|
medulla |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.