| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
The gravitational interaction of Earth and the Moon is responsible for which of these?
day and night cycle |
|
the northern lights |
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tides |
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seasons |
Tides are caused by the gravitational interaction of Earth and the Moon.
Heredity is the passing on of physical or mental characteristics genetically from one __________ to another.
generation |
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cell |
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species |
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family |
Heredity is the passing on of physical or mental characteristics genetically from one generation to another. Heredity is made possible via large strings of chromosomes which carry information encoded in genes.
__________ and __________ pair to strengthen bones.
iron, calcium |
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calcium, vitamin A |
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vitamin D, magnesium |
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vitamin D, calcium |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
acid |
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alkaline |
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base |
|
solution |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.
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:
primary consumers |
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scavengers |
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producers |
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decomposers |
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.