| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
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work |
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kinetic energy |
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power |
Force is applied to change an object's speed or direction of motion.
Within DNA, a variety of a particular gene is called a(n):
homozygous |
|
allele |
|
chromosome |
|
heterozygous |
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.
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets are Earth-like |
|
the planets have moons |
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the planets have magnetic fields |
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the planets have water |
The four planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called terrestrial (Earth-like) planets because, like the Earth, they're solid with inner metal cores covered by rocky surfaces.
During digestion, where is digested food absorbed into the blood stream?
small intestine |
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large intestine |
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stomach |
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pancreas |
The small intestine is where most digestion takes place. As food travels along the small intestine it gets broken down completely by enzymes secreted from the walls. These enzymes are produced in the small intestine as well as in the pancreas and liver. After the enzymes break down the food, the resulting substances are then absorbed into the blood via capillaries in the small intestine walls.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
exoskeleton |
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vertebrate |
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endoskeleton |
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bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.