| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
__________ is caused by a lack of iron in the diet.
diabetes |
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scurvy |
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anemia |
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shingles |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
Which of the following is not true about mass and weight?
weight depends on the location where it is measured |
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weight is the force exerted on an object by gravity |
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mass is the amount of matter something has |
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mass depends on the location where it is measured |
Mass is the amount of matter something has while weight is the force exerted on an object's mass by gravity. So, although a person's mass doesn't change when going from the Earth to the Moon, their weight will decrease because the force of the Moon's gravity is much less than that of Earth.
Blood is created in:
the heart |
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the liver |
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bone marrow |
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red blood cells |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Within DNA, a variety of a particular gene is called a(n):
heterozygous |
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chromosome |
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allele |
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homozygous |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.
Earth's breathable air is held in which atmospheric layer?
troposphere |
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thermosphere |
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mesosphere |
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stratosphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.