| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
stomach |
|
mouth |
|
large intestine |
|
small intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
The fossil record is a product of which period of Earth's history?
Cambrian |
|
Cenozoic |
|
Jurassic |
|
Cretaceous |
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.
Water freezing or boiling is an example of which of the following?
sublimation |
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heating |
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phase transition |
|
cooling |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
In the metric system, what prefix represents 103?
kilo |
|
centi |
|
mega |
|
milli |
Kilo is the metric system prefix for 103.
An element in the physical state of __________ maintains neither a constant volume nor a constant shape.
solid |
|
gas |
|
liquid |
|
plasma |
The gaseous state occurs at a higher temperature range than the solid and liquid states of the same substance. In this state, molecules flow very freely around each other and will spread out as far as they're able. Gases maintain neither a constant volume nor a constant shape.