| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
convection |
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radiation |
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conduction |
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reflection |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Bronchioles, alveolus, and capillaries are vital parts of which bodily system?
circulation |
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digestion |
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respiration |
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nervous |
The trachea branches into the left and right bronchi which each lead to a lung where the bronchi subdivide into smaller tubes called bronchioles. Each bronchiole ends in a small sac called an alveolus which allows oxygen from the air to enter the bloodstream via tiny blood vessels called capillaries.
Which of the following is not a characteristic of the Sun?
is composed of hydrogen and helium |
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makes up over 99% of the mass of the solar system |
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formed 2.6 billion years ago |
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is a yellow dwarf star |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
sentient |
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vertebrate |
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arthropod |
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spiny |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
inherent |
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kinetic |
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gravitational |
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potential |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.