| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.48 |
| Score | 0% | 70% |
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
conduction |
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convection |
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radiation |
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reflection |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Materials like metals that transfer heat efficiently are called:
refractors |
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insulators |
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reflectors |
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conductors |
Heat is always transferred from warmer to cooler environments and conduction is the simplest way this transfer can occur. It is accomplished through direct contact between materials and materials like metals that transfer heat efficiently are called conductors while those that conduct heat poorly, such as plastic, are called insulators.
Which of the following indicates the correct reproductive sequence?
ovum → fetus → zygote |
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ovum → zygote → fetus |
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none of these are correct |
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zygote → ovum → fetus |
During intercourse, the penis ejaculates sperm, produced in the testes, into the vagina. Some of the sperm makes their way to the uterus where, if they encounter an egg to fertilize, unite with the ovum to form a fertilized egg or zygote. The zygote then may implant in the uterus and eventually develop into a fetus.
__________ and __________ pair to strengthen bones.
vitamin D, calcium |
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vitamin D, magnesium |
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calcium, vitamin A |
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iron, calcium |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets have water |
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the planets are Earth-like |
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the planets have magnetic fields |
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the planets have moons |
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.