| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
The Sun is a __________-type main-sequence star.
D |
|
S |
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G |
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E |
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.
Universal donor blood can be given to a person with any blood type. Which blood type is the universal donor?
AB |
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O-positive |
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O-negative |
|
O |
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, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
scavengers |
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primary consumers |
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decomposers |
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producers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
Which of the following states of matter exists at the highest temperature?
solid |
|
none of these |
|
liquid |
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gas |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
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day and night cycle |
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the northern lights |
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tides |
Tides are caused by the gravitational interaction of Earth and the Moon.