| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
In the food chain, omnivores may be which of the following?
secondary consumers or scavengers |
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primary or secondary consumers |
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secondary or tertiary consumers |
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primary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
Which of the following indicates the correct reproductive sequence?
ovum → fetus → zygote |
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none of these are correct |
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ovum → zygote → fetus |
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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.
As part of digestion, the liver produces bile which breaks down:
protein |
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sugars |
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starches |
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fat |
The liver produces bile which emulsifies (separates) fat.
Changes to an object's speed or direction of motion are caused by which of the following?
kinetic energy |
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a force |
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power |
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work |
Force is applied to change an object's speed or direction of motion.
Veins carry blood __________ the heart.
all of these |
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away from |
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back to |
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within |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.