There are 6 elements that are the most important. The acronym, CHNOPS, is an easy way to remember these.
C - Carbon
H - Hydrogen
N - Nitrogen
O - Oxygen
P - Phosphorous
S - Sulfur
Answer:
A device to measure the dimensions of a object
Explanation:
Hii...so the answer is
The four layers are the external oblique, internal oblique, transverse abdominals.
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