| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.57 |
| Score | 0% | 71% |
The number system most used in science is the:
American system |
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metric system |
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British system |
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English system |
The metric system is a number system that designates one base unit for each type of measurement. For example, the base unit for length is the meter and the base unit for mass is the gram.
Which of the following is the correct order for types of radiation from lowest to highest frequency?
microwaves → radio waves → visible light |
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radio waves → visible light → gamma rays |
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visible light → ultraviolet light → radio waves |
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infrared waves → microwaves → ultraviolet light |
The electromagnetic spectrum covers all possible wavelengths and frequencies of radiation. From lowest frequency (longest wavelength) to highest frequency (shortest wavelength) radiation: radio waves → microwaves → infrared waves → visible light → ultraviolet light → X-rays → gamma rays.
Arteries carry __________ blood at __________ pressure.
oxygenated, high |
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deoxygenated, low |
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deoxygenated, high |
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oxygenated, low |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
In the classification of life, bacteria, archaea and eukaryota are which of the following?
kingdoms |
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species |
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domains |
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classes |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Which of the following is the smallest component of an element that still retains the properties of the element?
atom |
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element |
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neutron |
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molecule |
An atom is the smallest component of an element that still retains the properties of the element.