| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.70 |
| Score | 0% | 74% |
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?
reflection |
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convection |
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radiation |
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conduction |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
A human heart consists of how many chambers?
2 |
|
4 |
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8 |
|
1 |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
An air mass is a large body of air that has which of the following characteristics?
similar density |
|
similar moisture |
|
all of these |
|
similar temperature |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
Reproductive haploids are also known as:
gametes |
|
sperm |
|
diploids |
|
ovum |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.
In the food chain, consumers are classified as which of the following?
secondary |
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primary |
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tertiary |
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all of these |
Most animals consume other organisms to survive. Consumers (heterotrophs) are divided into three types, primary, secondary, and tertiary, based on their place in the food chain.