Question

fill ups
1) food is preserved _____,_____,_____,_____,.
2) ______ and _______ are two diseases caused by protozoa.
3) the o process of converting ammonia into nitrates is called _____.
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Answer 1

Answer:

1)drying, refrigerating,fermentation,freezing

2)Malaria,trypanosomiasis

3) nitrification