| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.63 |
| Score | 0% | 73% |
Menstruation occurs when:
the ovum becomes fertilized |
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the fetus is formed |
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the zygote is formed |
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the ovum fails to become fertilized |
If the ovum fails to become fertilized, the lining of the uterus sloughs off during menstruation. From puberty to menopause, this cycle of menstruation repeats monthly (except during pregnancy).
Which of these is not a recognized blood type?
B |
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AO |
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AB |
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O |
Blood is categorized into four different types (A, B, AB, and O) based on the type of antigens found on the outside of the red blood cells. Additionally, each type can be negative or positive based on whether or not the cells have an antigen called the Rh factor.
Molecules and atoms that are inputs to a chemical reaction are known as which of the following?
fuel |
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reactants |
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products |
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components |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
The rows of the Periodic Table of the Elements are called:
periods |
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families |
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shells |
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groups |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
A major difference between sound waves and light waves is which of the following?
all of these are correct |
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a sound wave cannot travel through a vacuum |
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a sound wave is mechanical while a light wave is electromagnetic |
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a sound wave is much slower than a light wave |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.