| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.63 |
| Score | 0% | 73% |
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
proton |
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electron |
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atom |
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neutron |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.
During digestion, after proteins are broken down where does the undigested food go next?
esophagus |
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stomach |
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large intestine |
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small intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
arthropod |
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sentient |
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vertebrate |
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spiny |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Which of the following is related to the Cambrian Explosion?
first civilizations |
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extinction of dinosaurs |
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fossil record |
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carbon dating |
The Cambrian period is one of the most significant geological time periods. Lasting about 53 million years, it marked a dramatic burst of changes in life on Earth known as the Cambrian Explosion. It is from this period that the majority of the history of life on Earth, as documented by fossils, is found. Called the fossil record, the layering of these mineralized imprints of organisms preserved in sedementary rock have allowed geologists to build a historical record of plant and animal life on Earth.
The respiratory and circulatory systems are similar in that they:
add carbon dioxide |
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transport oxygen |
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deoxygenate blood |
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transport nutrients |
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.