Bacteria cultures that have been allowed to undergo fermentation have been used commercially for centuries in the production of
a. bread
b. beer
c. wine
d. yogurt

The right answer is D. Yogurt

Bread, beer, and wine are also prepared by fermentation, but the micro-organisms here are the yeast, not bacteria.

Yogurt is a milk fermented by the development of lactic acid bacteria Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus which must be sown simultaneously and be alive in the finished product.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.