| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
Earth's history is divided into time periods, which of these is the shortest time period?
eon |
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epoch |
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period |
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age |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.
The coldest point in the Earth's atmosphere is reached in which atmospheric layer?
troposphere |
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stratosphere |
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mesosphere |
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thermosphere |
In the mesosphere, temperature again drops as altitude increases until the coldest point in the Earth's atmosphere, the mesopause, is reached where temperatures fall to −225 °F (−143 °C).
Universal donor blood can be given to a person with any blood type. Which blood type is the universal donor?
O |
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O-negative |
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O-positive |
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AB |
Blood transfer is limited by the type and Rh factor of the blood. Someone who has Rh-factor negative blood cannot receive blood with a positive type but a person with Rh-factor positive type blood can receive Rh-negative blood. Type O negative blood is the universal donor because it can be given to a person with any blood type. Type AB positive is the universal recipient meaning someone with this blood type can receive any other type of blood.
In the food chain, omnivores may be which of the following?
secondary or tertiary consumers |
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primary or secondary consumers |
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secondary consumers or scavengers |
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primary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
__________ is caused by a lack of iron in the diet.
scurvy |
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diabetes |
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shingles |
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anemia |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.