Answer:
3
Explanation:
if you divide 7 and 21 you get 3 groups and if you 7x3 is 21
Answer:
Manure is recognized as an excellent source of plant nutrients nitrogen (N), phosphorus (P), and potassium (K). In addition, manure returns organic matter and other nutrients such as calcium, magnesium, and sulfur to the soil, building soil fertility and quality.
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