Frequency is the correct answer
Answer:
The blood picks up co2 and also waste from the tissue. So I am guessing that it is co2.
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Answer:
bean-shaped organs in the back part of the abdominal cavity that create and excrete urine
This statement best describes the kidneys because it tells you the:
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If you are being followed too closely while driving, you should slow down and keep to the right, allowing the following vehicle to pass.
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