Answer:
The source is current, because you shouldn't rely on information from 50 years ago.
Answer:
provides protection to the valves and heart chambers.
Explanation:
Answer:
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Explanation:
Answer:
The correct option is A: Standardization
Explanation:
Standardization is a method used in research for gathering and treating participants for a particular study. It is used when the result of one group is to be compared with the result of a second group, and hence each group must be given equal opportunities to succeed. This process is often lengthy. Bob used this sample of children because he wanted standardization.
The answer is “Tar” the same stuff they make roads with.