| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
In the food chain, consumers are classified as which of the following?
secondary |
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tertiary |
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primary |
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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.
Arteries carry __________ blood at __________ pressure.
oxygenated, low |
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oxygenated, high |
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deoxygenated, low |
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deoxygenated, high |
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.
Which of blood component fights infection?
white blood cells |
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platelets |
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plasma |
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red blood cells |
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 metric system, what prefix represents 103?
centi |
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kilo |
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mega |
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milli |
Kilo is the metric system prefix for 103.
The formula for acceleration is which of the following?
\(\vec{a} = { m \over F }\) |
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\(\vec{a} = \vec{F} m\) |
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\(\vec{a} = { m \over \vec{F} }\) |
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\(\vec{a} = { \vec{F} \over m }\) |
Newton's second law of motion leads to the formula for acceleration which is a measure of the rate of change of velocity per unit time and, if you solve for positive acceleration, reveals how much net force is needed to overcome an object's mass. The formula for acceleration is \(\vec{a} = { \vec{F} \over m }\) or, solving for force, \(\vec{F} = m\vec{a}\).