Answer:
Explanation:
There are several different kinds of assessments of cardiorespiratory fitness such as timed runs, timed walks, and step tests. Using multiple, different fitness assessments gives a more complete picture of the various factors that contribute to an individual's level of cardiorespiratory fitness.
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The correct answer is A.<span>filtering wastes from the blood.
The kidney has many important functions in the body. Most of them have to do with bodily fluids and waste. It filters about 123 to 150 quarts of blood per day and produces 1 to 2 quarts of urine per day. 
B. is incorrect because does not defend or fight other organisms. 
C. is incorrect because the kidney does not digest anything whatsoever.
D. is incorrect because the kidney does not transport any nutrients anywhere.</span>