| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
In the food chain, omnivores may be which of the following?
secondary or tertiary consumers |
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secondary consumers or scavengers |
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primary or secondary consumers |
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primary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
bronchioles |
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blood cells |
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capillaries |
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diaphragms |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
When light travels between two substances it bends. This is called:
conduction |
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refraction |
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convection |
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reflection |
Because different materials have different refractive indices, light changes speed when passing from one material to another. This causes the light to bend (refraction) at an angle that depends on the change in refractive index between the materials. The greater the difference, the higher the angle of refraction.
The hottest of Earth's atmospheric layers is which of the following?
stratosphere |
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troposphere |
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mesosphere |
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thermosphere |
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.
A dominant trait will be expressed when paired with:
a recessive trait |
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a dominant trait |
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a gene |
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a chromosome |
The traits represented by genes are inherited independently of each other (one from the male and one from the female gamete) and a trait can be dominant or recessive. A dominant trait will be expressed when paired with a recessive trait while two copies of a recessive trait (one from each parent) must be present for the recessive trait to be expressed.