| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.64 |
| Score | 0% | 73% |
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets have moons |
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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 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.
Which of blood component carries oxygen?
red blood cells |
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platelets |
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white blood cells |
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plasma |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
In the heart, blood flows from the __________ ventricle to the lungs then back to the heart via the __________ atrium.
right, right |
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left, right |
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right, left |
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left, left |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
Which of these is not a component of blood?
white blood cells |
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red blood cells |
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plasma |
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marrow |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Which of the following is not true of light waves?
travel faster than sound waves |
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can travel through a vacuum |
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are electromagnetic waves |
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are mechanical waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.