| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
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:
decomposers |
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scavengers |
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primary consumers |
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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.
As part of digestion, the liver produces bile which breaks down:
sugars |
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protein |
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fat |
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starches |
The liver produces bile which emulsifies (separates) fat.
Changes to an object's speed or direction of motion are caused by which of the following?
power |
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kinetic energy |
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work |
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a force |
Force is applied to change an object's speed or direction of motion.
Poor balance could indicate an issue with which part of the nervous system?
cerebrum |
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cerebellum |
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spinal cord |
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medulla |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
Which of the following is related to the Cambrian Explosion?
fossil record |
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carbon dating |
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first civilizations |
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extinction of dinosaurs |
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.