| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.83 |
| Score | 0% | 57% |
As part of digestion, the liver produces bile which breaks down:
starches |
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protein |
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fat |
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sugars |
The liver produces bile which emulsifies (separates) fat.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
side effects |
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products |
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results |
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reactants |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Which of the following is not true of light waves?
can travel through a vacuum |
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are mechanical waves |
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travel faster than sound waves |
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are electromagnetic waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
Which of the following is not true about mass and weight?
mass is the amount of matter something has |
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weight is the force exerted on an object by gravity |
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weight depends on the location where it is measured |
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mass depends on the location where it is measured |
Mass is the amount of matter something has while weight is the force exerted on an object's mass by gravity. So, although a person's mass doesn't change when going from the Earth to the Moon, their weight will decrease because the force of the Moon's gravity is much less than that of Earth.
Which of the following is true about species groups?
a community is made up of a group of populations |
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a population is made up of a group of communities |
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a biome is a made up of a group of biospheres |
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an ecosystem is a biological population |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.