| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.60 |
| Score | 0% | 52% |
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
blood cells |
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diaphragms |
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capillaries |
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bronchioles |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
compound |
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atom |
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molecule |
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element |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
Neurons are part of the __________ nervous system.
somatic |
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autonomic |
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central |
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peripheral |
The nervous system consists of the brain and spinal cord (central nervous system) and the peripheral nervous system which is the network of nerve cells (neurons) that collect and distribute signals from the central nervous system throughout the body.
Acceleration is the rate of change of velocity per unit of time. Which of these is the formula for acceleration?
\(\vec{a} = { \Delta \vec{v} \over t }\) |
|
\(\vec{a} = { t \over \Delta \vec{v} }\) |
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\(\vec{a} = { \vec{v} \over t }\) |
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\(\vec{a} = \Delta \vec{v} t \) |
Acceleration is the rate of change of velocity per unit of time. In physics, the delta symbol (\(\Delta\)) represents change so the formula for acceleration becomes \(\vec{a} = { \Delta \vec{v} \over t }\)
As part of the carbon cycle, plants release carbon into the atmosphere through which process?
decomposition |
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sedimentation |
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photosynthesis |
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evaporation |
The carbon cycle represents the ciruit of carbon through Earth's ecosystem. Carbon dioxide (CO2) in the atmosphere is absorbed by plants through photosynthesis. Plants then die and release carbon back into the atmosphere during decomposition or are eaten by animals who breathe (respiration) the carbon into the atmosphere they exhale and produce waste which also releases carbon as it decays.