| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.76 |
| Score | 0% | 75% |
Changes to an object's speed or direction of motion are caused by which of the following?
kinetic energy |
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work |
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power |
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a force |
Force is applied to change an object's speed or direction of motion.
A biological community of interacting organisms and their physical environment is known as:
population |
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community |
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ecosystem |
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biome |
An ecosystem is a biological community of interacting organisms and their physical environment. This includes both the biotic (living) and abiotic (non-living).
Which of the following is the formula for power?
\(P = {w \over t}\) |
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\(P = w t\) |
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\(P = \vec{w}t\) |
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\(P = {\vec{w} \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
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:
producers |
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decomposers |
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scavengers |
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primary consumers |
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.
__________ is caused by a lack of iron in the diet.
shingles |
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anemia |
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diabetes |
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scurvy |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.