| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
neutron |
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electron |
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proton |
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atom |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.
The respiratory and circulatory systems are similar in that they:
deoxygenate blood |
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transport nutrients |
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transport oxygen |
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add carbon dioxide |
Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.
Which of the following is not a characteristic of the Sun?
formed 2.6 billion years ago |
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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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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.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
results |
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reactants |
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products |
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side effects |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Blood is created in:
the liver |
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the heart |
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bone marrow |
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red blood cells |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.